Merge remote-tracking branch 'upstream/master' into userreguserreg

58 files changed, 1599 insertions, 263 deletions

diff --git a/runtime/indent/README.txt b/runtime/indent/README.txt
index 649870636e..05ab126c8c 100644
--- a/runtime/indent/README.txt
+++ b/runtime/indent/README.txt
@@ -6,15 +6,16 @@ at ":help indent-expression".  Looking at the existing files should give you
 inspiration.
 
 If you make a new indent file which would be useful for others, please send it
-to Bram@vim.org.  Include instructions for detecting the file type for this
-language, by file name extension or by checking a few lines in the file.
-And please stick to the rules below.
+to the vim-dev mailing list <vim-dev@vim.org>.  Include instructions for
+detecting the file type for this language, by file name extension or by
+checking a few lines in the file. And please stick to the rules below.
 
 If you have remarks about an existing file, send them to the maintainer of
-that file.  Only when you get no response send a message to Bram@vim.org.
+that file.  Only when you get no response send a message to the vim-dev
+mailing list: <vim-dev@vim.org>.
 
 If you are the maintainer of an indent file and make improvements, e-mail the
-new version to Bram@vim.org.
+new version to the vim-dev mailing list: <vim-dev@vim.org>.
 
 
 Rules for making an indent file:
diff --git a/runtime/indent/aap.vim b/runtime/indent/aap.vim
index 35828b4c1a..23c104985e 100644
--- a/runtime/indent/aap.vim
+++ b/runtime/indent/aap.vim
@@ -1,7 +1,8 @@
 " Vim indent file
 " Language:	Aap recipe
-" Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2005 Jun 24
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
diff --git a/runtime/indent/bash.vim b/runtime/indent/bash.vim
index b91640687c..407081232c 100644
--- a/runtime/indent/bash.vim
+++ b/runtime/indent/bash.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:	bash
-" Maintainer:	Bram
-" Last Change:	2019 Sep 27
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 13
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
diff --git a/runtime/indent/c.vim b/runtime/indent/c.vim
index e224382f63..7f285e1b98 100644
--- a/runtime/indent/c.vim
+++ b/runtime/indent/c.vim
@@ -1,7 +1,8 @@
 " Vim indent file
 " Language:	C
-" Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2005 Mar 27
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
diff --git a/runtime/indent/cdl.vim b/runtime/indent/cdl.vim
index 2c0fc7988e..da675698cf 100644
--- a/runtime/indent/cdl.vim
+++ b/runtime/indent/cdl.vim
@@ -21,7 +21,7 @@ endif
 
 " find out if an "...=..." expression is an assignment (or a conditional)
 " it scans 'line' first, and then the previous lines
-fun! CdlAsignment(lnum, line)
+fun! CdlAssignment(lnum, line)
   let f = -1
   let lnum = a:lnum
   let line = a:line
@@ -90,7 +90,7 @@ fun! CdlGetIndent(lnum)
     end
   end
 
-  " remove members [a] of [b]:[c]... (inicio remainds valid)
+  " remove members [a] of [b]:[c]... (inicio remains valid)
   let line = substitute(line, '\c\(\[[^]]*]\(\s*of\s*\|:\)*\)\+', ' ', 'g')
   while 1
     " search for the next interesting element
@@ -111,7 +111,7 @@ fun! CdlGetIndent(lnum)
     else " c == '='
       " if it is an assignment increase indent
       if f == -1 " we don't know yet, find out
-	let f = CdlAsignment(lnum, strpart(line, 0, inicio))
+	let f = CdlAssignment(lnum, strpart(line, 0, inicio))
       end
       if f == 1 " formula increase it
 	let ind = ind + shiftwidth()
@@ -125,7 +125,7 @@ fun! CdlGetIndent(lnum)
     let ind = ind - shiftwidth()
   elseif match(thisline, '^\s*=') >= 0
     if f == -1 " we don't know yet if is an assignment, find out
-      let f = CdlAsignment(lnum, "")
+      let f = CdlAssignment(lnum, "")
     end
     if f == 1 " formula increase it
       let ind = ind + shiftwidth()
diff --git a/runtime/indent/ch.vim b/runtime/indent/ch.vim
index e1bd8a356c..11b1f67790 100644
--- a/runtime/indent/ch.vim
+++ b/runtime/indent/ch.vim
@@ -3,6 +3,7 @@
 " Maintainer:	SoftIntegration, Inc. <info@softintegration.com>
 " URL:		http://www.softintegration.com/download/vim/indent/ch.vim
 " Last change:	2006 Apr 30
+" 		2023 Aug 28 by Vim Project (undo_indent)
 "		Created based on cpp.vim
 "
 " Ch is a C/C++ interpreter with many high level extensions
@@ -16,3 +17,5 @@ let b:did_indent = 1
 
 " Ch indenting is built-in, thus this is very simple
 setlocal cindent
+
+let b:undo_indent = "setlocal cindent<"
diff --git a/runtime/indent/cpp.vim b/runtime/indent/cpp.vim
index ffa37d7208..bb4dfd185e 100644
--- a/runtime/indent/cpp.vim
+++ b/runtime/indent/cpp.vim
@@ -1,7 +1,8 @@
 " Vim indent file
 " Language:	C++
-" Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2008 Nov 29
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
diff --git a/runtime/indent/cuda.vim b/runtime/indent/cuda.vim
index 68ee9cec0c..5980ddda44 100644
--- a/runtime/indent/cuda.vim
+++ b/runtime/indent/cuda.vim
@@ -1,7 +1,8 @@
 " Vim indent file
 " Language:	CUDA
-" Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2008 Nov 29
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
diff --git a/runtime/indent/dts.vim b/runtime/indent/dts.vim
new file mode 100644
index 0000000000..e87f8153c7
--- /dev/null
+++ b/runtime/indent/dts.vim
@@ -0,0 +1,63 @@
+" Vim indent file
+" Language:		Device Tree
+" Maintainer:		Roland Hieber, Pengutronix <rhi@pengutronix.de>
+"
+if exists("b:did_indent")
+    finish
+endif
+let b:did_indent = 1
+
+setlocal autoindent
+setlocal nosmartindent
+setlocal indentkeys=o,O,0},0<>>,!<Ctrl-F>
+setlocal indentexpr=GetDTSIndent()
+setlocal nolisp
+
+let b:undo_indent = 'setl autoindent< smartindent< indentkeys< indentexpr< lisp<'
+
+function GetDTSIndent()
+    let sw        = shiftwidth()
+    let lnum      = v:lnum
+    let line      = getline(lnum)
+    let prevline  = getline(prevnonblank(lnum-1))
+    let prevind   = indent(prevnonblank(lnum-1))
+
+    if prevnonblank(lnum-1) < 1
+        return 0
+    endif
+
+    " Don't indent header and preprocessor directives
+    if line =~ '^\s*\(/dts-\|#\(include\|define\|undef\|warn\(ing\)\?\|error\|if\(n\?def\)\?\|else\|elif\|endif\)\)'
+        return 0
+
+    " Don't indent /node and &label blocks
+    elseif line =~ '^\s*[/&].\+{\s*$'
+        return 0
+
+    " Indent to matching bracket or remove one shiftwidth if line begins with } or >
+    elseif line =~ '^\s*[}>]'
+        " set cursor to closing bracket on current line
+        let col = matchend(line, '^\s*[>}]')
+        call cursor(lnum, col)
+        
+        " determine bracket type, {} or <>
+        let pair = strpart('{}<>', stridx('}>', line[col-1]) * 2, 2)
+
+        " find matching bracket pair
+        let pairline = searchpair(pair[0], '', pair[1], 'bW')
+
+        if pairline > 0 
+            return indent(pairline)
+        else
+            return prevind - sw
+        endif
+
+    " else, add one level of indent if line ends in { or < or = or ,
+    elseif prevline =~ '[{<=,]$'
+        return prevind + sw
+
+    else
+        return prevind
+    endif
+
+endfunction
diff --git a/runtime/indent/dune.vim b/runtime/indent/dune.vim
index 0590d66d13..a9349e4e04 100644
--- a/runtime/indent/dune.vim
+++ b/runtime/indent/dune.vim
@@ -3,6 +3,7 @@
 " Maintainers:  Markus Mottl         <markus.mottl@gmail.com>
 " URL:          https://github.com/ocaml/vim-ocaml
 " Last Change:  2021 Jan 01
+"               2023 Aug 28 by Vim Project (undo_indent)
 
 if exists("b:did_indent")
  finish
@@ -11,3 +12,5 @@ let b:did_indent = 1
 
 " dune format-dune-file uses 1 space to indent
 setlocal softtabstop=1 shiftwidth=1 expandtab
+
+let b:undo_indent = "setl et< sts< sw<"
diff --git a/runtime/indent/erlang.vim b/runtime/indent/erlang.vim
index 7aa38587a6..5682c31ef3 100644
--- a/runtime/indent/erlang.vim
+++ b/runtime/indent/erlang.vim
@@ -1324,7 +1324,7 @@ function! s:ErlangCalcIndent2(lnum, stack)
           "   maybe A else
           "               LTI
           "
-          " Note about Emacs compabitility {{{
+          " Note about Emacs compatibility {{{
           "
           " It would be fine to indent the examples above the following way:
           "
diff --git a/runtime/indent/fish.vim b/runtime/indent/fish.vim
new file mode 100644
index 0000000000..e7678cb7c8
--- /dev/null
+++ b/runtime/indent/fish.vim
@@ -0,0 +1,85 @@
+" Vim indent file
+" Language:     fish
+" Maintainer:   Nicholas Boyle (github.com/nickeb96)
+" Repository:   https://github.com/nickeb96/fish.vim
+" Last Change:  February 4, 2023
+"               2023 Aug 28 by Vim Project (undo_indent)
+
+if exists("b:did_indent")
+    finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetFishIndent(v:lnum)
+setlocal indentkeys+==end,=else,=case
+
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
+function s:PrevCmdStart(linenum)
+    let l:linenum = a:linenum
+    " look for the first line that isn't a line continuation
+    while l:linenum > 1 && getline(l:linenum - 1) =~# '\\$'
+        let l:linenum = l:linenum - 1
+    endwhile
+    return l:linenum
+endfunction
+
+function GetFishIndent(lnum)
+    let l:shiftwidth = shiftwidth()
+
+    let l:prevlnum = prevnonblank(a:lnum - 1)
+    if l:prevlnum ==# 0
+        return 0
+    endif
+
+    " if the previous line ended with a line continuation
+    if getline(a:lnum - 1) =~# '\\$'
+        if a:lnum ==# 0 || getline(a:lnum - 2) !~# '\\$'
+            " this is the first line continuation in a chain, so indent it
+            return indent(a:lnum - 1) + l:shiftwidth
+        else
+            " use the same indentation as the previous continued line
+            return indent(a:lnum - 1)
+        endif
+    endif
+
+    let l:prevlnum = s:PrevCmdStart(l:prevlnum)
+
+    let l:prevline = getline(l:prevlnum)
+    if l:prevline =~# '^\s*\(begin\|if\|else\|while\|for\|function\|case\|switch\)\>'
+        let l:indent = l:shiftwidth
+    else
+        let l:indent = 0
+    endif
+
+    let l:line = getline(a:lnum)
+    if l:line =~# '^\s*end\>'
+        " find end's matching start
+        let l:depth = 1
+        let l:currentlnum = a:lnum
+        while l:depth > 0 && l:currentlnum > 0
+            let l:currentlnum = s:PrevCmdStart(prevnonblank(l:currentlnum - 1))
+            let l:currentline = getline(l:currentlnum)
+            if l:currentline =~# '^\s*end\>'
+                let l:depth = l:depth + 1
+            elseif l:currentline =~# '^\s*\(begin\|if\|while\|for\|function\|switch\)\>'
+                let l:depth = l:depth - 1
+            endif
+        endwhile
+        if l:currentline =~# '^\s*switch\>'
+            return indent(l:currentlnum)
+        else
+            return indent(l:prevlnum) + l:indent - l:shiftwidth
+        endif
+    elseif l:line =~# '^\s*else\>'
+        return indent(l:prevlnum) + l:indent - l:shiftwidth
+    elseif l:line =~# '^\s*case\>'
+        if getline(l:prevlnum) =~# '^\s*switch\>'
+            return indent(l:prevlnum) + l:indent
+        else
+            return indent(l:prevlnum) + l:indent - l:shiftwidth
+        endif
+    else
+        return indent(l:prevlnum) + l:indent
+    endif
+endfunction
diff --git a/runtime/indent/go.vim b/runtime/indent/go.vim
index bf9ff75e6c..a9b1d8d19b 100644
--- a/runtime/indent/go.vim
+++ b/runtime/indent/go.vim
@@ -2,6 +2,7 @@
 " Language:	Go
 " Maintainer:	David Barnett (https://github.com/google/vim-ft-go)
 " Last Change:	2017 Jun 13
+"		2023 Aug 28 by Vim Project (undo_indent)
 "
 " TODO:
 " - function invocations split across lines
@@ -19,6 +20,8 @@ setlocal autoindent
 setlocal indentexpr=GoIndent(v:lnum)
 setlocal indentkeys+=<:>,0=},0=)
 
+let b:undo_indent = "setl ai< inde< indk< lisp<"
+
 if exists('*GoIndent')
   finish
 endif
diff --git a/runtime/indent/hare.vim b/runtime/indent/hare.vim
index bc4fea4e61..0a9d8dafd8 100644
--- a/runtime/indent/hare.vim
+++ b/runtime/indent/hare.vim
@@ -2,6 +2,7 @@
 " Language: Hare
 " Maintainer: Amelia Clarke <me@rsaihe.dev>
 " Last Change: 2022 Sep 22
+"              2023 Aug 28 by Vim Project (undo_indent)
 
 if exists("b:did_indent")
   finish
@@ -40,6 +41,8 @@ setlocal cinwords=if,else,for,switch,match
 
 setlocal indentexpr=GetHareIndent()
 
+let b:undo_indent = "setl cin< cino< cinw< inde< indk<"
+
 function! FloorCindent(lnum)
   return cindent(a:lnum) / shiftwidth() * shiftwidth()
 endfunction
diff --git a/runtime/indent/html.vim b/runtime/indent/html.vim
index 65e0ffc40c..2fa10cc91e 100644
--- a/runtime/indent/html.vim
+++ b/runtime/indent/html.vim
@@ -1,7 +1,7 @@
 " Vim indent script for HTML
-" Maintainer:	Bram Moolenaar
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
 " Original Author: Andy Wokula <anwoku@yahoo.de>
-" Last Change:	2022 Jan 31
+" Last Change:	2023 Aug 13
 " Version:	1.0 "{{{
 " Description:	HTML indent script with cached state for faster indenting on a
 "		range of lines.
diff --git a/runtime/indent/jsonc.vim b/runtime/indent/jsonc.vim
index bf8e501dd5..058634a6d2 100644
--- a/runtime/indent/jsonc.vim
+++ b/runtime/indent/jsonc.vim
@@ -4,6 +4,7 @@
 " Acknowledgement:  Based off of vim-json maintained by Eli Parra <eli@elzr.com>
 "                   https://github.com/elzr/vim-json
 " Last Change:      2021-07-01
+"                   2023 Aug 28 by Vim Project (undo_indent)
 
 " 0. Initialization {{{1
 " =================
@@ -20,6 +21,8 @@ setlocal nosmartindent
 setlocal indentexpr=GetJSONCIndent()
 setlocal indentkeys=0{,0},0),0[,0],!^F,o,O,e
 
+let b:undo_indent = "setlocal indentexpr< indentkeys< smartindent<"
+
 " Only define the function once.
 if exists("*GetJSONCIndent")
   finish
diff --git a/runtime/indent/julia.vim b/runtime/indent/julia.vim
index 8e4c60322e..efc98a2851 100644
--- a/runtime/indent/julia.vim
+++ b/runtime/indent/julia.vim
@@ -3,7 +3,8 @@
 " Maintainer:	Carlo Baldassi <carlobaldassi@gmail.com>
 " Homepage:	https://github.com/JuliaEditorSupport/julia-vim
 " Last Change:	2022 Jun 14
-" Notes:        originally based on Bram Molenaar's indent file for vim
+"		2023 Aug 28 by Vim Project (undo_indent)
+" Notes:        originally based on Bram Moolenaar's indent file for vim
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -21,6 +22,8 @@ setlocal indentkeys-=0{
 setlocal indentkeys-=0}
 setlocal nosmartindent
 
+let b:undo_indent = "setl ai< inde< indk< si<"
+
 " Only define the function once.
 if exists("*GetJuliaIndent")
   finish
@@ -307,7 +310,7 @@ function IsFunctionArgPar(lnum, c)
 endfunction
 
 function JumpToMatch(lnum, last_closed_bracket)
-  " we use the % command to skip back (tries to ues matchit if possible,
+  " we use the % command to skip back (tries to use matchit if possible,
   " otherwise resorts to vim's default, which is buggy but better than
   " nothing)
   call cursor(a:lnum, a:last_closed_bracket)
diff --git a/runtime/indent/kotlin.vim b/runtime/indent/kotlin.vim
new file mode 100644
index 0000000000..590a5074d1
--- /dev/null
+++ b/runtime/indent/kotlin.vim
@@ -0,0 +1,60 @@
+" Vim indent file
+" Language:     Kotlin
+" Maintainer:   Alexander Udalov
+" URL:          https://github.com/udalov/kotlin-vim
+" Last Change:  7 November 2021
+"               2023 Sep 17 by Vim Project (undo_indent)
+
+if exists('b:did_indent')
+    finish
+endif
+let b:did_indent = 1
+
+setlocal cinoptions& cinoptions+=j1,L0
+setlocal indentexpr=GetKotlinIndent()
+setlocal indentkeys=0},0),!^F,o,O,e,<CR>
+setlocal autoindent " TODO ?
+
+let b:undo_indent = "setlocal autoindent< cinoptions< indentexpr< indentkeys<"
+
+" TODO teach it to count bracket balance, etc.
+function! GetKotlinIndent()
+    if v:lnum == 0
+        return 0
+    endif
+
+    let prev_num = prevnonblank(v:lnum - 1)
+    let prev = getline(prev_num)
+    let prev_indent = indent(prev_num)
+    let cur = getline(v:lnum)
+
+    if cur =~ '^\s*\*'
+        return cindent(v:lnum)
+    endif
+
+    if prev =~ '^\s*\*/'
+        let st = prev
+        while st > 1
+            if getline(st) =~ '^\s*/\*'
+                break
+            endif
+            let st = st - 1
+        endwhile
+        return indent(st)
+    endif
+
+    let prev_open_paren = prev =~ '^.*(\s*$'
+    let cur_close_paren = cur =~ '^\s*).*$'
+    let prev_open_brace = prev =~ '^.*\({\|->\)\s*$'
+    let cur_close_brace = cur =~ '^\s*}.*$'
+
+    if prev_open_paren && !cur_close_paren || prev_open_brace && !cur_close_brace
+        return prev_indent + shiftwidth()
+    endif
+
+    if cur_close_paren && !prev_open_paren || cur_close_brace && !prev_open_brace
+        return prev_indent - shiftwidth()
+    endif
+
+    return prev_indent
+endfunction
diff --git a/runtime/indent/krl.vim b/runtime/indent/krl.vim
index cc3cbd1abb..89f45356ba 100644
--- a/runtime/indent/krl.vim
+++ b/runtime/indent/krl.vim
@@ -41,7 +41,7 @@ function GetKrlIndent() abort
   let currentLine = getline(v:lnum)
   if  currentLine =~? '\v^;(\s*(end)?fold>)@!' && !get(g:, 'krlCommentIndent', 0)
     " If current line has a ; in column 1 and is no fold, keep zero indent.
-    " This may be usefull if code is commented out at the first column.
+    " This may be useful if code is commented out at the first column.
     return 0
   endif
 
@@ -117,7 +117,7 @@ function s:KrlPreNoneBlank(lnum) abort
   let nPreNoneBlank = prevnonblank(a:lnum)
 
   while nPreNoneBlank > 0 && getline(nPreNoneBlank) =~? '\v^\s*(\&\w\+|;|continue>)'
-    " Previouse none blank line irrelevant. Look further aback.
+    " Previous none blank line irrelevant. Look further aback.
     let nPreNoneBlank = prevnonblank(nPreNoneBlank - 1)
   endwhile
 
diff --git a/runtime/indent/livebook.vim b/runtime/indent/livebook.vim
new file mode 100644
index 0000000000..6311050e0e
--- /dev/null
+++ b/runtime/indent/livebook.vim
@@ -0,0 +1,9 @@
+" Placeholder livebook indent file.
+" This simply uses the markdown indenting.
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+
+runtime! indent/markdown.vim
diff --git a/runtime/indent/logtalk.vim b/runtime/indent/logtalk.vim
index 8e36f86115..f7a8b0387c 100644
--- a/runtime/indent/logtalk.vim
+++ b/runtime/indent/logtalk.vim
@@ -1,5 +1,6 @@
 "  Maintainer:	Paulo Moura <pmoura@logtalk.org>
 "  Revised on:	2018.08.04
+"		2023 Aug 28 by Vim Project (undo_indent)
 "  Language:	Logtalk
 
 " This Logtalk indent file is a modified version of the Prolog
@@ -16,6 +17,8 @@ setlocal indentexpr=GetLogtalkIndent()
 setlocal indentkeys-=:,0#
 setlocal indentkeys+=0%,-,0;,>,0)
 
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
 " Only define the function once.
 if exists("*GetLogtalkIndent")
 	finish
diff --git a/runtime/indent/lua.vim b/runtime/indent/lua.vim
index 0d1f934a03..35b08d4037 100644
--- a/runtime/indent/lua.vim
+++ b/runtime/indent/lua.vim
@@ -27,6 +27,16 @@ if exists("*GetLuaIndent")
 endif
 
 function! GetLuaIndent()
+    let ignorecase_save = &ignorecase
+  try
+    let &ignorecase = 0
+    return GetLuaIndentIntern()
+  finally
+    let &ignorecase = ignorecase_save
+  endtry
+endfunction
+
+function! GetLuaIndentIntern()
   " Find a non-blank line above the current line.
   let prevlnum = prevnonblank(v:lnum - 1)
 
@@ -41,7 +51,7 @@ function! GetLuaIndent()
   let prevline = getline(prevlnum)
   let midx = match(prevline, '^\s*\%(if\>\|for\>\|while\>\|repeat\>\|else\>\|elseif\>\|do\>\|then\>\)')
   if midx == -1
-    let midx = match(prevline, '{\s*$')
+    let midx = match(prevline, '{\s*\%(--\%([^[].*\)\?\)\?$')
     if midx == -1
       let midx = match(prevline, '\<function\>\s*\%(\k\|[.:]\)\{-}\s*(')
     endif
diff --git a/runtime/indent/luau.vim b/runtime/indent/luau.vim
new file mode 100644
index 0000000000..69893f7399
--- /dev/null
+++ b/runtime/indent/luau.vim
@@ -0,0 +1,14 @@
+" Vim filetype indent file
+" Language:    Luau
+" Maintainer:  None yet
+" Last Change: 2023 Apr 30
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+    finish
+endif
+
+" Luau is a superset of Lua
+runtime! indent/lua.vim
+
+
diff --git a/runtime/indent/mail.vim b/runtime/indent/mail.vim
index 22bb0f7e12..eec9b4e43d 100644
--- a/runtime/indent/mail.vim
+++ b/runtime/indent/mail.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:	Mail
-" Maintainer:	Bram Moolenaar
-" Last Change:	2021 Sep 26
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 13
 
 if exists("b:did_indent")
   finish
diff --git a/runtime/indent/nsis.vim b/runtime/indent/nsis.vim
index 5d3decca37..3731781201 100644
--- a/runtime/indent/nsis.vim
+++ b/runtime/indent/nsis.vim
@@ -15,7 +15,7 @@ setlocal nosmartindent
 setlocal noautoindent
 setlocal indentexpr=GetNsisIndent(v:lnum)
 setlocal indentkeys=!^F,o,O
-setlocal indentkeys+==~${Else,=~${EndIf,=~${EndUnless,=~${AndIf,=~${AndUnless,=~${OrIf,=~${OrUnless,=~${Case,=~${Default,=~${EndSelect,=~${EndSwith,=~${Loop,=~${Next,=~${MementoSectionEnd,=~FunctionEnd,=~SectionEnd,=~SectionGroupEnd,=~PageExEnd,0=~!macroend,0=~!if,0=~!else,0=~!endif
+setlocal indentkeys+==~${Else,=~${EndIf,=~${EndUnless,=~${AndIf,=~${AndUnless,=~${OrIf,=~${OrUnless,=~${Case,=~${Default,=~${EndSelect,=~${EndSwitch,=~${Loop,=~${Next,=~${MementoSectionEnd,=~FunctionEnd,=~SectionEnd,=~SectionGroupEnd,=~PageExEnd,0=~!macroend,0=~!if,0=~!else,0=~!endif
 
 let b:undo_indent = "setl ai< inde< indk< si<"
 
diff --git a/runtime/indent/ocaml.vim b/runtime/indent/ocaml.vim
index 19c81f49c4..c9beb8be0b 100644
--- a/runtime/indent/ocaml.vim
+++ b/runtime/indent/ocaml.vim
@@ -4,7 +4,8 @@
 "               Mike Leary           <leary@nwlink.com>
 "               Markus Mottl         <markus.mottl@gmail.com>
 " URL:          https://github.com/ocaml/vim-ocaml
-" Last Change:  2017 Jun 13
+" Last Change:  2023 Aug 28 - Add undo_indent (Vim Project)
+"               2017 Jun 13
 "               2005 Jun 25 - Fixed multiple bugs due to 'else\nreturn ind' working
 "               2005 May 09 - Added an option to not indent OCaml-indents specially (MM)
 "               2013 June   - commented textwidth (Marc Weber)
@@ -24,6 +25,8 @@ setlocal indentkeys+=0=and,0=class,0=constraint,0=done,0=else,0=end,0=exception,
 setlocal nolisp
 setlocal nosmartindent
 
+let b:undo_indent = "setl et< inde< indk< lisp< si<"
+
 " At least Marc Weber and Markus Mottl do not like this:
 " setlocal textwidth=80
 
diff --git a/runtime/indent/perl.vim b/runtime/indent/perl.vim
index 4c91fa1b33..a97c34da53 100644
--- a/runtime/indent/perl.vim
+++ b/runtime/indent/perl.vim
@@ -4,7 +4,7 @@
 " Homepage:      https://github.com/vim-perl/vim-perl
 " Bugs/requests: https://github.com/vim-perl/vim-perl/issues
 " License:       Vim License (see :help license)
-" Last Change:   2021 Sep 24
+" Last Change:   2022 Jun 14
 
 " Suggestions and improvements by :
 "   Aaron J. Sherman (use syntax for hints)
@@ -133,6 +133,7 @@ function! GetPerlIndent()
                         \ || synid == "perlHereDoc"
                         \ || synid == "perlBraces"
                         \ || synid == "perlStatementIndirObj"
+                        \ || synid == "perlSubDeclaration"
                         \ || synid =~ "^perlFiledescStatement"
                         \ || synid =~ '^perl\(Sub\|Block\|Package\)Fold'
                 let brace = strpart(line, bracepos, 1)
diff --git a/runtime/indent/php.vim b/runtime/indent/php.vim
index 0e623689d5..377ffd5afb 100644
--- a/runtime/indent/php.vim
+++ b/runtime/indent/php.vim
@@ -3,8 +3,8 @@
 " Author:	John Wellesz <John.wellesz (AT) gmail (DOT) com>
 " URL:		https://www.2072productions.com/vim/indent/php.vim
 " Home:		https://github.com/2072/PHP-Indenting-for-VIm
-" Last Change:	2020 Mar 05
-" Version:	1.70
+" Last Change:	2023 August 18th
+" Version:	1.75
 "
 "
 "	Type :help php-indent for available options
@@ -128,7 +128,7 @@ setlocal nolisp
 setlocal indentexpr=GetPhpIndent()
 setlocal indentkeys=0{,0},0),0],:,!^F,o,O,e,*<Return>,=?>,=<?,=*/
 
-
+let b:undo_indent = "setl ai< cin< inde< indk< lisp< si<"
 
 let s:searchpairflags = 'bWr'
 
@@ -142,10 +142,10 @@ if exists("*GetPhpIndent")
 endif
 
 
-let s:endline = '\s*\%(//.*\|#.*\|/\*.*\*/\s*\)\=$'
+let s:endline = '\s*\%(//.*\|#\[\@!.*\|/\*.*\*/\s*\)\=$'
 let s:PHP_validVariable = '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'
-let s:notPhpHereDoc = '\%(break\|return\|continue\|exit\|die\|else\|end\%(if\|while\|for\|foreach\|switch\)\)'
-let s:blockstart = '\%(\%(\%(}\s*\)\=else\%(\s\+\)\=\)\=if\>\|\%(}\s*\)\?else\>\|do\>\|while\>\|switch\>\|case\>\|default\>\|for\%(each\)\=\>\|declare\>\|class\>\|trait\>\|\%()\s*\)\=use\>\|interface\>\|abstract\>\|final\>\|try\>\|\%(}\s*\)\=catch\>\|\%(}\s*\)\=finally\>\)'
+let s:notPhpHereDoc = '\<\%(break\|return\|continue\|exit\|die\|true\|false\|elseif\|else\|end\%(if\|while\|for\|foreach\|match\|switch\)\)\>'
+let s:blockstart = '\%(\%(\%(}\s*\)\=else\%(\s\+\)\=\)\=if\>\|\%(}\s*\)\?else\>\|do\>\|while\>\|match\>\|switch\>\|case\>\|default\>\|for\%(each\)\=\>\|declare\>\|class\>\|trait\>\|\%()\s*\)\=use\>\|interface\>\|abstract\>\|final\>\|try\>\|\%(}\s*\)\=catch\>\|\%(}\s*\)\=finally\>\)'
 let s:functionDeclPrefix = '\<function\>\%(\s\+&\='.s:PHP_validVariable.'\)\=\s*('
 let s:functionDecl = s:functionDeclPrefix.'.*'
 let s:multilineFunctionDecl = s:functionDeclPrefix.s:endline
@@ -156,7 +156,8 @@ let s:unstated = '\%(^\s*'.s:blockstart.'.*)\|\%(//.*\)\@<!\<e'.'lse\>\)'.s:endl
 
 let s:terminated = '\%(\%(;\%(\s*\%(?>\|}\)\)\=\|<<<\s*[''"]\=\a\w*[''"]\=$\|^\s*}\|^\s*'.s:PHP_validVariable.':\)'.s:endline.'\)'
 let s:PHP_startindenttag = '<?\%(.*?>\)\@!\|<script[^>]*>\%(.*<\/script>\)\@!'
-let s:structureHead = '^\s*\%(' . s:blockstart . '\)\|'. s:functionDecl . s:endline . '\|\<new\s\+class\>'
+let s:matchStart = 'match\s*(\s*\$\?'.s:PHP_validVariable.'\s*)\s*{'. s:endline
+let s:structureHead = '^\s*\%(' . s:blockstart . '\)\|'. s:functionDecl . s:endline . '\|\<new\s\+class\>\|' . s:matchStart
 
 
 let s:escapeDebugStops = 0
@@ -223,7 +224,7 @@ function! GetLastRealCodeLNum(startline) " {{{
 	    while getline(lnum) !~? tofind && lnum > 1
 		let lnum = lnum - 1
 	    endwhile
-	elseif lastline =~ '^\s*[''"`][;,]' || (lastline =~ '^[^''"`]*[''"`][;,]'.s:endline && IslinePHP(lnum, "") == "SpecStringEntrails")
+	elseif lastline =~ '^\s*[''"`][;,]'.s:endline || (lastline =~ '^[^''"`]*[''"`][;,]'.s:endline && IslinePHP(lnum, "") == "SpecStringEntrails")
 
 	    let tofind=substitute( lastline, '^.*\([''"`]\)[;,].*$', '^[^\1]\\+[\1]$\\|^[^\1]\\+[=([]\\s*[\1]', '')
 	    let trylnum = lnum
@@ -266,7 +267,7 @@ function! Skippmatch2()
 
     let line = getline(".")
 
-    if line =~ "\\([\"']\\).*/\\*.*\\1" || line =~ '\%(//\|#\).*/\*'
+    if line =~ "\\([\"']\\).*/\\*.*\\1" || line =~ '\%(//\|#\[\@!\).*/\*'
 	return 1
     else
 	return 0
@@ -322,18 +323,22 @@ function! BalanceDirection (str)
 endfun
 
 function! StripEndlineComments (line)
-    return substitute(a:line,"\\(//\\|#\\)\\(\\(\\([^\"']*\\([\"']\\)[^\"']*\\5\\)\\+[^\"']*$\\)\\|\\([^\"']*$\\)\\)",'','')
+
+    let cleaned = substitute(a:line,'\v(//|#\[\@!)((([^"'']*(["''])[^"'']*\5)+[^"'']*$)|([^"'']*$))','','')
+    if cleaned != a:line
+    endif
+    return cleaned
 endfun
 
 function! FindArrowIndent (lnum)  " {{{
 
-    let parrentArrowPos = -1
+    let parentArrowPos = -1
     let cursorPos = -1
     let lnum = a:lnum
     while lnum > 1
 	let last_line = getline(lnum)
 	if last_line =~ '^\s*->'
-	    let parrentArrowPos = indent(a:lnum)
+	    let parentArrowPos = indent(a:lnum)
 	    break
 	else
 
@@ -355,28 +360,28 @@ function! FindArrowIndent (lnum)  " {{{
 		    else
 		    endif
 		else
-		    let parrentArrowPos = -1
+		    let parentArrowPos = -1
 		    break
 		end
 	    endif
 
 	    if cleanedLnum =~ '->'
 		call cursor(lnum, cursorPos == -1 ? strwidth(cleanedLnum) : cursorPos)
-		let parrentArrowPos = searchpos('->', 'cWb', lnum)[1] - 1
+		let parentArrowPos = searchpos('->', 'cWb', lnum)[1] - 1
 
 		break
 	    else
-		let parrentArrowPos = -1
+		let parentArrowPos = -1
 		break
 	    endif
 	endif
     endwhile
 
-    if parrentArrowPos == -1
-	let parrentArrowPos = indent(lnum) + shiftwidth()
+    if parentArrowPos == -1
+	let parentArrowPos = indent(lnum) + shiftwidth()
     end
 
-    return parrentArrowPos
+    return parentArrowPos
 endfun "}}}
 
 function! FindTheIfOfAnElse (lnum, StopAfterFirstPrevElse) " {{{
@@ -490,7 +495,7 @@ function! ResetPhpOptions()
     if ! b:optionsset && &filetype =~ "php"
 	if b:PHP_autoformatcomment
 
-	    setlocal comments=s1:/*,mb:*,ex:*/,://,:#
+	    setlocal comments=s1:/*,mb:*,ex:*/,://,f:#[,:#
 
 	    setlocal formatoptions-=t
 	    setlocal formatoptions+=q
@@ -506,7 +511,7 @@ endfunc
 call ResetPhpOptions()
 
 function! GetPhpIndentVersion()
-    return "1.70-bundle"
+    return "1.75"
 endfun
 
 function! GetPhpIndent()
@@ -650,7 +655,7 @@ function! GetPhpIndent()
 		let b:InPHPcode_and_script = 1
 	    endif
 
-	elseif last_line =~ '^[^''"`]\+[''"`]$' && last_line !~ '^\s*\%(//\|#\|/\*.*\*/\s*$\)' " a string identifier with nothing after it and no other string identifier before
+	elseif last_line =~ '^[^''"`]\+[''"`]$' && last_line !~ '^\s*\%(//\|#\[\@!\|/\*.*\*/\s*$\)' " a string identifier with nothing after it and no other string identifier before
 	    let b:InPHPcode = -1
 	    let b:InPHPcode_tofind = substitute( last_line, '^.*\([''"`]\).*$', '^[^\1]*\1[;,]$', '')
 	elseif last_line =~? '<<<\s*[''"]\=\a\w*[''"]\=$'
@@ -674,7 +679,7 @@ function! GetPhpIndent()
 
     " Indent successive // or # comment the same way the first is {{{
     let addSpecial = 0
-    if cline =~ '^\s*\%(//\|#\|/\*.*\*/\s*$\)'
+    if cline =~ '^\s*\%(//\|#\[\@!\|/\*.*\*/\s*$\)'
 	let addSpecial = b:PHP_outdentSLComments
 	if b:PHP_LastIndentedWasComment == 1
 	    return indent(real_PHP_lastindented)
@@ -715,7 +720,7 @@ function! GetPhpIndent()
 	return 0
     endif
 
-    if cline =~? '^\s*\a\w*;$\|^\a\w*$\|^\s*[''"`][;,]' && cline !~? s:notPhpHereDoc
+    if (cline =~? '^\s*\a\w*;$\|^\a\w*$' || (cline =~? '^\s*[''"`][;,]' && IslinePHP(v:lnum, '[;,]') !~? '^\(phpString[SD]\|phpBacktick\)') ) && cline !~? s:notPhpHereDoc
 	return 0
     endif " }}}
 
@@ -738,6 +743,9 @@ function! GetPhpIndent()
     if cline =~ '^\s*}\%(}}\)\@!'
 	let ind = indent(FindOpenBracket(v:lnum, 1))
 	let b:PHP_CurrentIndentLevel = b:PHP_default_indenting
+	if  b:PHP_BracesAtCodeLevel
+	    let ind = ind + shiftwidth()
+	endif
 	return ind
     endif
 
@@ -761,7 +769,7 @@ function! GetPhpIndent()
     if last_line =~ '[;}]'.endline && last_line !~ '^[)\]]' && last_line !~# s:defaultORcase && last_line !~ '^\s*[''"`][;,]'
 	if ind==b:PHP_default_indenting
 	    return b:PHP_default_indenting + addSpecial
-	elseif b:PHP_indentinghuge && ind==b:PHP_CurrentIndentLevel && cline !~# '^\s*\%(else\|\%(case\|default\).*:\|[})];\=\)' && last_line !~# '^\s*\%(\%(}\s*\)\=else\)' && getline(GetLastRealCodeLNum(lnum - 1))=~';'.endline
+	elseif b:PHP_indentinghuge && ind==b:PHP_CurrentIndentLevel && cline !~# '^\s*\%(else\|\%(case\|default\).*:\|[})];\=\)' && last_line !~# '^\s*\%(\%(}\s*\)\=else\)\|^\(\s*\S\+\s*\)\+}'.endline && getline(GetLastRealCodeLNum(lnum - 1))=~';'.endline
 	    return b:PHP_CurrentIndentLevel + addSpecial
 	endif
     endif
@@ -929,7 +937,7 @@ function! GetPhpIndent()
 	    let ind = ind + shiftwidth()
 
 
-	elseif AntepenultimateLine =~ '{'.endline && AntepenultimateLine !~? '^\s*use\>' || AntepenultimateLine =~ terminated || AntepenultimateLine =~# s:defaultORcase
+	elseif AntepenultimateLine =~ '{'.endline && AntepenultimateLine !~? '^\s*use\>' && AntepenultimateLine !~? s:matchStart || AntepenultimateLine =~ terminated || AntepenultimateLine =~# s:defaultORcase
 	    let ind = ind + shiftwidth()
 	endif
 
diff --git a/runtime/indent/python.vim b/runtime/indent/python.vim
index 8c3d0b0670..42ab4f3778 100644
--- a/runtime/indent/python.vim
+++ b/runtime/indent/python.vim
@@ -1,8 +1,9 @@
 " Vim indent file
-" Language:		Python
-" Maintainer:		Bram Moolenaar <Bram@vim.org>
+" Language:	Python
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 " Original Author:	David Bustos <bustos@caltech.edu>
-" Last Change:		2021 Sep 26
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
diff --git a/runtime/indent/qml.vim b/runtime/indent/qml.vim
new file mode 100644
index 0000000000..8c9fa91250
--- /dev/null
+++ b/runtime/indent/qml.vim
@@ -0,0 +1,59 @@
+" Vim indent file
+" Language:     QML
+" Maintainer:   Chase Knowlden <haroldknowlden@gmail.com>
+" Last Change:  2023 Aug 16
+"
+" Improved JavaScript indent script.
+
+" Indent script in place for this already?
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
+setlocal indentexpr=s:GetQmlIndent()
+setlocal indentkeys=0{,0},0),0],:,!^F,o,O,e,*<Return>,=*/
+
+" Only define functions once per session
+if exists("*s:GetQmlIndent")
+  finish
+endif
+
+" Clean up a line of code by removing trailing '//' and '/* */' comments, and trimming
+" whitespace
+function! s:Trim(line)
+  return substitute(substitute(substitute(a:line, '// .*', '', ''), '/\* .* \*/', '', ''), '^\s*\|\s*$', '', 'g')
+endfunction
+
+function! s:GetQmlIndent()
+  let num = v:lnum
+  let line = s:Trim(getline(num))
+
+  let pnum = prevnonblank(num - 1)
+  if pnum == 0
+    return 0
+  endif
+  let pline = s:Trim(getline(pnum))
+
+  let ind = indent(pnum)
+
+  " bracket/brace/paren blocks
+  if pline =~ '[{[(]$'
+    let ind += &sw
+  endif
+  if line =~ '^[}\])]'
+    let ind -= &sw
+  endif
+
+  " '/*' comments
+  if pline =~ '^/\*.*\*/'
+    " no indent for single-line form
+  elseif pline =~ '^/\*'
+    let ind += 1
+  elseif pline =~ '^\*/'
+    let ind -= 1
+  endif
+
+  return ind
+endfunction
diff --git a/runtime/indent/quarto.vim b/runtime/indent/quarto.vim
new file mode 100644
index 0000000000..586d232d2b
--- /dev/null
+++ b/runtime/indent/quarto.vim
@@ -0,0 +1 @@
+runtime indent/rmd.vim
diff --git a/runtime/indent/r.vim b/runtime/indent/r.vim
index ca85a2e62d..07dfd13881 100644
--- a/runtime/indent/r.vim
+++ b/runtime/indent/r.vim
@@ -2,7 +2,7 @@
 " Language:	R
 " Author:	Jakson Alves de Aquino <jalvesaq@gmail.com>
 " Homepage:     https://github.com/jalvesaq/R-Vim-runtime
-" Last Change:	Sun Aug 19, 2018  09:13PM
+" Last Change:	Mon Feb 27, 2023  07:16PM
 
 
 " Only load this indent file when no other was loaded.
@@ -14,6 +14,8 @@ let b:did_indent = 1
 setlocal indentkeys=0{,0},:,!^F,o,O,e
 setlocal indentexpr=GetRIndent()
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the function once.
 if exists("*GetRIndent")
   finish
@@ -28,7 +30,7 @@ let g:r_indent_ess_comments   = get(g:, 'r_indent_ess_comments',    0)
 let g:r_indent_comment_column = get(g:, 'r_indent_comment_column', 40)
 let g:r_indent_ess_compatible = get(g:, 'r_indent_ess_compatible',  0)
 let g:r_indent_op_pattern     = get(g:, 'r_indent_op_pattern',
-      \ '\(&\||\|+\|-\|\*\|/\|=\|\~\|%\|->\)\s*$')
+      \ '\(&\||\|+\|-\|\*\|/\|=\|\~\|%\|->\||>\)\s*$')
 
 function s:RDelete_quotes(line)
   let i = 0
@@ -108,7 +110,7 @@ function s:RDelete_parens(line)
   return line1
 endfunction
 
-function! s:Get_paren_balance(line, o, c)
+function s:Get_paren_balance(line, o, c)
   let line2 = substitute(a:line, a:o, "", "g")
   let openp = strlen(a:line) - strlen(line2)
   let line3 = substitute(line2, a:c, "", "g")
@@ -116,7 +118,7 @@ function! s:Get_paren_balance(line, o, c)
   return openp - closep
 endfunction
 
-function! s:Get_matching_brace(linenr, o, c, delbrace)
+function s:Get_matching_brace(linenr, o, c, delbrace)
   let line = SanitizeRLine(getline(a:linenr))
   if a:delbrace == 1
     let line = substitute(line, '{$', "", "")
@@ -132,7 +134,7 @@ endfunction
 
 " This function is buggy because there 'if's without 'else'
 " It must be rewritten relying more on indentation
-function! s:Get_matching_if(linenr, delif)
+function s:Get_matching_if(linenr, delif)
   let line = SanitizeRLine(getline(a:linenr))
   if a:delif
     let line = substitute(line, "if", "", "g")
@@ -160,7 +162,7 @@ function! s:Get_matching_if(linenr, delif)
   endif
 endfunction
 
-function! s:Get_last_paren_idx(line, o, c, pb)
+function s:Get_last_paren_idx(line, o, c, pb)
   let blc = a:pb
   let line = substitute(a:line, '\t', s:curtabstop, "g")
   let theidx = -1
@@ -359,17 +361,19 @@ function GetRIndent()
   let olnum = s:Get_prev_line(lnum)
   let oline = getline(olnum)
   if olnum > 0
-    if line =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
-      if oline =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
+    if substitute(line, '#.*', '', '') =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
+      if substitute(oline, '#.*', '', '') =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
         return indent(lnum)
       else
         return indent(lnum) + shiftwidth()
       endif
     else
-      if oline =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
+      if substitute(oline, '#.*', '', '') =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
         return indent(lnum) - shiftwidth()
       endif
     endif
+  elseif substitute(line, '#.*', '', '') =~ g:r_indent_op_pattern && s:Get_paren_balance(line, "(", ")") == 0
+    return indent(lnum) + shiftwidth()
   endif
 
   let post_fun = 0
diff --git a/runtime/indent/raku.vim b/runtime/indent/raku.vim
index 3f9b49ec77..753a2b04be 100644
--- a/runtime/indent/raku.vim
+++ b/runtime/indent/raku.vim
@@ -4,6 +4,7 @@
 " Homepage:      https://github.com/vim-perl/vim-perl
 " Bugs/requests: https://github.com/vim-perl/vim-perl/issues
 " Last Change:   2020 Apr 15
+"                2023 Aug 28 by Vim Project (undo_indent)
 " Contributors:  Andy Lester <andy@petdance.com>
 "                Hinrik Örn Sigurðsson <hinrik.sig@gmail.com>
 "
@@ -47,6 +48,8 @@ if !b:indent_use_syntax
     setlocal indentkeys+=0=EO
 endif
 
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
 let s:cpo_save = &cpo
 set cpo-=C
 
diff --git a/runtime/indent/rapid.vim b/runtime/indent/rapid.vim
new file mode 100644
index 0000000000..b1fa00b8cc
--- /dev/null
+++ b/runtime/indent/rapid.vim
@@ -0,0 +1,255 @@
+" ABB Rapid Command indent file for Vim
+" Language: ABB Rapid Command
+" Maintainer: Patrick Meiser-Knosowski <knosowski@graeffrobotics.de>
+" Version: 2.2.7
+" Last Change: 12. May 2023
+" Credits: Based on indent/vim.vim
+"
+" Suggestions of improvement are very welcome. Please email me!
+"
+" Known bugs: ../doc/rapid.txt
+"
+" TODO
+" * indent wrapped lines which do not end with an ; or special key word,
+"     maybe this is a better idea, but then () and [] has to be changed as
+"     well
+"
+
+if exists("g:rapidNoSpaceIndent")
+  if !exists("g:rapidSpaceIndent")
+    let g:rapidSpaceIndent = !g:rapidNoSpaceIndent
+  endif
+  unlet g:rapidNoSpaceIndent
+endif
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent") || get(g:,'rapidNoIndent',0)
+  finish
+endif
+let b:did_indent = 1
+
+setlocal nolisp
+setlocal nosmartindent
+setlocal autoindent
+setlocal indentexpr=GetRapidIndent()
+if get(g:,'rapidNewStyleIndent',0)
+  setlocal indentkeys=!^F,o,O,0=~endmodule,0=~error,0=~undo,0=~backward,0=~endproc,0=~endrecord,0=~endtrap,0=~endfunc,0=~else,0=~endif,0=~endtest,0=~endfor,0=~endwhile,:,<[>,<]>,<(>,<)>
+else
+  setlocal indentkeys=!^F,o,O,0=~endmodule,0=~error,0=~undo,0=~backward,0=~endproc,0=~endrecord,0=~endtrap,0=~endfunc,0=~else,0=~endif,0=~endtest,0=~endfor,0=~endwhile,:
+endif
+let b:undo_indent="setlocal lisp< si< ai< inde< indk<"
+
+if get(g:,'rapidSpaceIndent',1)
+  " Use spaces for indention, 2 is enough. 
+  " More or even tabs wastes space on the teach pendant.
+  setlocal softtabstop=2
+  setlocal shiftwidth=2
+  setlocal expandtab
+  setlocal shiftround
+  let b:undo_indent = b:undo_indent." sts< sw< et< sr<"
+endif
+
+" Only define the function once.
+if exists("*GetRapidIndent")
+  finish
+endif
+
+let s:keepcpo= &cpo
+set cpo&vim
+
+function GetRapidIndent()
+  let ignorecase_save = &ignorecase
+  try
+    let &ignorecase = 0
+    return s:GetRapidIndentIntern()
+  finally
+    let &ignorecase = ignorecase_save
+  endtry
+endfunction
+
+function s:GetRapidIndentIntern() abort
+
+  let l:currentLineNum = v:lnum
+  let l:currentLine = getline(l:currentLineNum)
+
+  if  l:currentLine =~ '^!' && !get(g:,'rapidCommentIndent',0)
+    " If current line is ! line comment, do not change indent
+    " This may be useful if code is commented out at the first column.
+    return 0
+  endif
+
+  " Find a non-blank line above the current line.
+  let l:preNoneBlankLineNum = s:RapidPreNoneBlank(v:lnum - 1)
+  if  l:preNoneBlankLineNum == 0
+    " At the start of the file use zero indent.
+    return 0
+  endif
+
+  let l:preNoneBlankLine = getline(l:preNoneBlankLineNum)
+  let l:ind = indent(l:preNoneBlankLineNum)
+
+  " Define add a 'shiftwidth' pattern
+  let l:addShiftwidthPattern  = '\c\v^\s*('
+  let l:addShiftwidthPattern .=           '((local|task)\s+)?(module|record|proc|func|trap)\s+\k'
+  let l:addShiftwidthPattern .=           '|(backward|error|undo)>'
+  let l:addShiftwidthPattern .=         ')'
+  "
+  " Define Subtract 'shiftwidth' pattern
+  let l:subtractShiftwidthPattern  = '\c\v^\s*('
+  let l:subtractShiftwidthPattern .=           'end(module|record|proc|func|trap)>'
+  let l:subtractShiftwidthPattern .=           '|(backward|error|undo)>'
+  let l:subtractShiftwidthPattern .=         ')'
+
+  " Add shiftwidth
+  if l:preNoneBlankLine =~ l:addShiftwidthPattern
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "then",     0)>=0
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "else",     0)>=0
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "do",       0)>=0
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "case",     0)>=0
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "default",  0)>=0
+    let l:ind += &sw
+  endif
+
+  " Subtract shiftwidth
+  if l:currentLine =~ l:subtractShiftwidthPattern
+        \|| s:RapidLenTilStr(l:currentLineNum, "endif",     0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "endfor",    0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "endwhile",  0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "endtest",   0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "else",      0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "elseif",    0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "case",      0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "default",   0)>=0
+    let l:ind = l:ind - &sw
+  endif
+
+  " First case (or default) after a test gets the indent of the test.
+  if (s:RapidLenTilStr(l:currentLineNum, "case", 0)>=0 || s:RapidLenTilStr(l:currentLineNum, "default", 0)>=0) && s:RapidLenTilStr(l:preNoneBlankLineNum, "test", 0)>=0
+    let l:ind += &sw
+  endif
+
+  " continued lines with () or []
+  let l:OpenSum  = s:RapidLoneParen(l:preNoneBlankLineNum,"(") + s:RapidLoneParen(l:preNoneBlankLineNum,"[")
+  if get(g:,'rapidNewStyleIndent',0)
+    let l:CloseSum = s:RapidLoneParen(l:preNoneBlankLineNum,")") + s:RapidLoneParen(l:currentLineNum,"]")
+  else
+    let l:CloseSum = s:RapidLoneParen(l:preNoneBlankLineNum,")") + s:RapidLoneParen(l:preNoneBlankLineNum,"]")
+  endif
+  if l:OpenSum > l:CloseSum
+    let l:ind += (l:OpenSum * 4 * &sw)
+  elseif l:OpenSum < l:CloseSum
+    let l:ind -= (l:CloseSum * 4 * &sw)
+  endif
+
+  return l:ind
+endfunction
+
+" Returns the length of the line until a:str occur outside a string or
+" comment. Search starts at string index a:startIdx.
+" If a:str is a word also add word boundaries and case insensitivity.
+" Note: rapidTodoComment and rapidDebugComment are not taken into account.
+function s:RapidLenTilStr(lnum, str, startIdx) abort
+
+  let l:line = getline(a:lnum)
+  let l:len  = strlen(l:line)
+  let l:idx  = a:startIdx
+  let l:str  = a:str
+  if l:str =~ '^\k\+$'
+    let l:str = '\c\<' . l:str . '\>'
+  endif
+
+  while l:len > l:idx
+    let l:idx = match(l:line, l:str, l:idx)
+    if l:idx < 0
+      " a:str not found
+      return -1
+    endif
+    let l:synName = synIDattr(synID(a:lnum,l:idx+1,0),"name")
+    if         l:synName != "rapidString"
+          \&&  l:synName != "rapidConcealableString"
+          \&& (l:synName != "rapidComment" || l:str =~ '^!')
+      " a:str found outside string or line comment
+      return l:idx
+    endif
+    " a:str is part of string or line comment
+    let l:idx += 1 " continue search for a:str
+  endwhile
+  
+  " a:str not found or l:len <= a:startIdx
+  return -1
+endfunction
+
+" a:lchar should be one of (, ), [, ], { or }
+" returns the number of opening/closing parentheses which have no
+" closing/opening match in getline(a:lnum)
+function s:RapidLoneParen(lnum,lchar) abort
+  if a:lchar == "(" || a:lchar == ")"
+    let l:opnParChar = "("
+    let l:clsParChar = ")"
+  elseif a:lchar == "[" || a:lchar == "]"
+    let l:opnParChar = "["
+    let l:clsParChar = "]"
+  elseif a:lchar == "{" || a:lchar == "}"
+    let l:opnParChar = "{"
+    let l:clsParChar = "}"
+  else
+    return 0
+  endif
+
+  let l:line = getline(a:lnum)
+
+  " look for the first ! which is not part of a string 
+  let l:len = s:RapidLenTilStr(a:lnum,"!",0)
+  if l:len == 0
+    return 0 " first char is !; ignored
+  endif
+
+  let l:opnParen = 0
+  " count opening brackets
+  let l:i = 0
+  while l:i >= 0
+    let l:i = s:RapidLenTilStr(a:lnum, l:opnParChar, l:i)
+    if l:i >= 0
+      let l:opnParen += 1
+      let l:i += 1
+    endif
+  endwhile
+
+  let l:clsParen = 0
+  " count closing brackets
+  let l:i = 0
+  while l:i >= 0
+    let l:i = s:RapidLenTilStr(a:lnum, l:clsParChar, l:i)
+    if l:i >= 0
+      let l:clsParen += 1
+      let l:i += 1
+    endif
+  endwhile
+
+  if (a:lchar == "(" || a:lchar == "[" || a:lchar == "{") && l:opnParen>l:clsParen
+    return (l:opnParen-l:clsParen)
+  elseif (a:lchar == ")" || a:lchar == "]" || a:lchar == "}") && l:clsParen>l:opnParen
+    return (l:clsParen-l:opnParen)
+  endif
+
+  return 0
+endfunction
+
+" This function works almost like prevnonblank() but handles %%%-headers and
+" comments like blank lines
+function s:RapidPreNoneBlank(lnum) abort
+
+  let nPreNoneBlank = prevnonblank(a:lnum)
+
+  while nPreNoneBlank>0 && getline(nPreNoneBlank) =~ '\v\c^\s*(\%\%\%|!)'
+    " Previous none blank line irrelevant. Look further aback.
+    let nPreNoneBlank = prevnonblank(nPreNoneBlank - 1)
+  endwhile
+
+  return nPreNoneBlank
+endfunction
+
+let &cpo = s:keepcpo
+unlet s:keepcpo
+
+" vim:sw=2 sts=2 et
diff --git a/runtime/indent/rhelp.vim b/runtime/indent/rhelp.vim
index cf69ae3392..334802ab78 100644
--- a/runtime/indent/rhelp.vim
+++ b/runtime/indent/rhelp.vim
@@ -2,7 +2,7 @@
 " Language:	R Documentation (Help), *.Rd
 " Author:	Jakson Alves de Aquino <jalvesaq@gmail.com>
 " Homepage:     https://github.com/jalvesaq/R-Vim-runtime
-" Last Change:	Tue Apr 07, 2015  04:38PM
+" Last Change:	Mon Feb 27, 2023  07:01PM
 
 
 " Only load this indent file when no other was loaded.
@@ -20,6 +20,8 @@ setlocal nolisp
 setlocal indentkeys=0{,0},:,!^F,o,O,e
 setlocal indentexpr=GetCorrectRHelpIndent()
 
+let b:undo_indent = "setl ai< cin< inde< indk< lisp< si<"
+
 " Only define the functions once.
 if exists("*GetRHelpIndent")
   finish
diff --git a/runtime/indent/rmd.vim b/runtime/indent/rmd.vim
index 8fd57257fa..a043b0c994 100644
--- a/runtime/indent/rmd.vim
+++ b/runtime/indent/rmd.vim
@@ -2,7 +2,7 @@
 " Language:	Rmd
 " Author:	Jakson Alves de Aquino <jalvesaq@gmail.com>
 " Homepage:     https://github.com/jalvesaq/R-Vim-runtime
-" Last Change:	Sun Mar 28, 2021  08:05PM
+" Last Change:	Wed Nov 09, 2022  09:44PM
 
 
 " Only load this indent file when no other was loaded.
@@ -16,6 +16,8 @@ let b:did_indent = 1
 setlocal indentkeys=0{,0},<:>,!^F,o,O,e
 setlocal indentexpr=GetRmdIndent()
 
+let b:undo_indent = "setl inde< indk<"
+
 if exists("*GetRmdIndent")
   finish
 endif
@@ -47,6 +49,8 @@ function s:GetMdIndent()
     return indent(v:lnum - 1) + 2
   elseif pline =~ '^\s*\d\+\.\s\+'
     return indent(v:lnum - 1) + 3
+  elseif pline =~ '^\[\^\S\+\]: '
+    return indent(v:lnum - 1) + shiftwidth()
   endif
   return indent(prevnonblank(v:lnum - 1))
 endfunction
diff --git a/runtime/indent/rnoweb.vim b/runtime/indent/rnoweb.vim
index 73966868b8..668cdb7ddd 100644
--- a/runtime/indent/rnoweb.vim
+++ b/runtime/indent/rnoweb.vim
@@ -2,7 +2,7 @@
 " Language:	Rnoweb
 " Author:	Jakson Alves de Aquino <jalvesaq@gmail.com>
 " Homepage:     https://github.com/jalvesaq/R-Vim-runtime
-" Last Change:	Fri Apr 15, 2016  10:58PM
+" Last Change:	Mon Feb 27, 2023  07:17PM
 
 
 " Only load this indent file when no other was loaded.
@@ -11,7 +11,7 @@ if exists("b:did_indent")
 endif
 runtime indent/tex.vim
 
-function! s:NoTeXIndent()
+function s:NoTeXIndent()
   return indent(line("."))
 endfunction
 
@@ -29,6 +29,8 @@ let b:did_indent = 1
 setlocal indentkeys=0{,0},!^F,o,O,e,},=\bibitem,=\item
 setlocal indentexpr=GetRnowebIndent()
 
+let b:undo_indent = "setl inde< indk<"
+
 if exists("*GetRnowebIndent")
   finish
 endif
diff --git a/runtime/indent/rrst.vim b/runtime/indent/rrst.vim
index f3ee53e7fb..585c5e6654 100644
--- a/runtime/indent/rrst.vim
+++ b/runtime/indent/rrst.vim
@@ -2,7 +2,7 @@
 " Language:	Rrst
 " Author:	Jakson Alves de Aquino <jalvesaq@gmail.com>
 " Homepage:     https://github.com/jalvesaq/R-Vim-runtime
-" Last Change:	Tue Apr 07, 2015  04:38PM
+" Last Change:	Feb 25, 2023
 
 
 " Only load this indent file when no other was loaded.
@@ -16,6 +16,8 @@ let b:did_indent = 1
 setlocal indentkeys=0{,0},:,!^F,o,O,e
 setlocal indentexpr=GetRrstIndent()
 
+let b:undo_indent = "setl inde< indk<"
+
 if exists("*GetRrstIndent")
   finish
 endif
diff --git a/runtime/indent/rst.vim b/runtime/indent/rst.vim
index a31ad8e080..e3c10865a6 100644
--- a/runtime/indent/rst.vim
+++ b/runtime/indent/rst.vim
@@ -4,6 +4,7 @@
 " Maintainer: Marshall Ward <marshall.ward@gmail.com>
 " Previous Maintainer: Nikolai Weibull <now@bitwi.se>
 " Latest Revision: 2020-03-31
+"                  2023 Aug 28 by Vim Project (undo_indent)
 
 if exists("b:did_indent")
   finish
@@ -14,6 +15,8 @@ setlocal indentexpr=GetRSTIndent()
 setlocal indentkeys=!^F,o,O
 setlocal nosmartindent
 
+let b:undo_indent = "setlocal indentexpr< indentkeys< smartindent<"
+
 if exists("*GetRSTIndent")
   finish
 endif
diff --git a/runtime/indent/ruby.vim b/runtime/indent/ruby.vim
index 6ce8529fd1..ea5a2a7494 100644
--- a/runtime/indent/ruby.vim
+++ b/runtime/indent/ruby.vim
@@ -4,7 +4,7 @@
 " Previous Maintainer:	Nikolai Weibull <now at bitwi.se>
 " URL:			https://github.com/vim-ruby/vim-ruby
 " Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
-" Last Change:		2022 Mar 22
+" Last Change:		2022 Jun 30
 
 " 0. Initialization {{{1
 " =================
@@ -93,7 +93,7 @@ let s:ruby_indent_keywords =
       \    '\<\%(if\|for\|while\|until\|case\|unless\|begin\):\@!\>'
 
 " Def without an end clause: def method_call(...) = <expression>
-let s:ruby_endless_def = '\<def\s\+\k\+[!?]\=\%((.*)\|\s\)\s*='
+let s:ruby_endless_def = '\<def\s\+\%(\k\+\.\)\=\k\+[!?]\=\%((.*)\|\s\)\s*='
 
 " Regex used for words that, at the start of a line, remove a level of indent.
 let s:ruby_deindent_keywords =
diff --git a/runtime/indent/rust.vim b/runtime/indent/rust.vim
index d30629b64e..7c055ec739 100644
--- a/runtime/indent/rust.vim
+++ b/runtime/indent/rust.vim
@@ -1,213 +1,286 @@
 " Vim indent file
 " Language:         Rust
 " Author:           Chris Morgan <me@chrismorgan.info>
-" Last Change:      2017 Jun 13
+" Last Change:      2023-09-11
 " For bugs, patches and license go to https://github.com/rust-lang/rust.vim
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
-	finish
+    finish
 endif
 let b:did_indent = 1
 
 setlocal cindent
-setlocal cinoptions=L0,(0,Ws,J1,j1
-setlocal cinkeys=0{,0},!^F,o,O,0[,0]
+setlocal cinoptions=L0,(s,Ws,J1,j1,m1
+setlocal cinkeys=0{,0},!^F,o,O,0[,0],0(,0)
 " Don't think cinwords will actually do anything at all... never mind
-setlocal cinwords=for,if,else,while,loop,impl,mod,unsafe,trait,struct,enum,fn,extern
+setlocal cinwords=for,if,else,while,loop,impl,mod,unsafe,trait,struct,enum,fn,extern,macro
 
 " Some preliminary settings
 setlocal nolisp		" Make sure lisp indenting doesn't supersede us
 setlocal autoindent	" indentexpr isn't much help otherwise
 " Also do indentkeys, otherwise # gets shoved to column 0 :-/
-setlocal indentkeys=0{,0},!^F,o,O,0[,0]
+setlocal indentkeys=0{,0},!^F,o,O,0[,0],0(,0)
 
 setlocal indentexpr=GetRustIndent(v:lnum)
 
+let b:undo_indent = "setlocal cindent< cinoptions< cinkeys< cinwords< lisp< autoindent< indentkeys< indentexpr<"
+
 " Only define the function once.
 if exists("*GetRustIndent")
-	finish
+    finish
 endif
 
+" vint: -ProhibitAbbreviationOption
 let s:save_cpo = &cpo
 set cpo&vim
+" vint: +ProhibitAbbreviationOption
 
 " Come here when loading the script the first time.
 
 function! s:get_line_trimmed(lnum)
-	" Get the line and remove a trailing comment.
-	" Use syntax highlighting attributes when possible.
-	" NOTE: this is not accurate; /* */ or a line continuation could trick it
-	let line = getline(a:lnum)
-	let line_len = strlen(line)
-	if has('syntax_items')
-		" If the last character in the line is a comment, do a binary search for
-		" the start of the comment.  synID() is slow, a linear search would take
-		" too long on a long line.
-		if synIDattr(synID(a:lnum, line_len, 1), "name") =~ 'Comment\|Todo'
-			let min = 1
-			let max = line_len
-			while min < max
-				let col = (min + max) / 2
-				if synIDattr(synID(a:lnum, col, 1), "name") =~ 'Comment\|Todo'
-					let max = col
-				else
-					let min = col + 1
-				endif
-			endwhile
-			let line = strpart(line, 0, min - 1)
-		endif
-		return substitute(line, "\s*$", "", "")
-	else
-		" Sorry, this is not complete, nor fully correct (e.g. string "//").
-		" Such is life.
-		return substitute(line, "\s*//.*$", "", "")
-	endif
+    " Get the line and remove a trailing comment.
+    " Use syntax highlighting attributes when possible.
+    " NOTE: this is not accurate; /* */ or a line continuation could trick it
+    let line = getline(a:lnum)
+    let line_len = strlen(line)
+    if has('syntax_items')
+        " If the last character in the line is a comment, do a binary search for
+        " the start of the comment.  synID() is slow, a linear search would take
+        " too long on a long line.
+        if synIDattr(synID(a:lnum, line_len, 1), "name") =~? 'Comment\|Todo'
+            let min = 1
+            let max = line_len
+            while min < max
+                let col = (min + max) / 2
+                if synIDattr(synID(a:lnum, col, 1), "name") =~? 'Comment\|Todo'
+                    let max = col
+                else
+                    let min = col + 1
+                endif
+            endwhile
+            let line = strpart(line, 0, min - 1)
+        endif
+        return substitute(line, "\s*$", "", "")
+    else
+        " Sorry, this is not complete, nor fully correct (e.g. string "//").
+        " Such is life.
+        return substitute(line, "\s*//.*$", "", "")
+    endif
 endfunction
 
 function! s:is_string_comment(lnum, col)
-	if has('syntax_items')
-		for id in synstack(a:lnum, a:col)
-			let synname = synIDattr(id, "name")
-			if synname == "rustString" || synname =~ "^rustComment"
-				return 1
-			endif
-		endfor
-	else
-		" without syntax, let's not even try
-		return 0
-	endif
+    if has('syntax_items')
+        for id in synstack(a:lnum, a:col)
+            let synname = synIDattr(id, "name")
+            if synname ==# "rustString" || synname =~# "^rustComment"
+                return 1
+            endif
+        endfor
+    else
+        " without syntax, let's not even try
+        return 0
+    endif
 endfunction
 
+if exists('*shiftwidth')
+    function! s:shiftwidth()
+        return shiftwidth()
+    endfunc
+else
+    function! s:shiftwidth()
+        return &shiftwidth
+    endfunc
+endif
+
 function GetRustIndent(lnum)
+    " Starting assumption: cindent (called at the end) will do it right
+    " normally. We just want to fix up a few cases.
+
+    let line = getline(a:lnum)
+
+    if has('syntax_items')
+        let synname = synIDattr(synID(a:lnum, 1, 1), "name")
+        if synname ==# "rustString"
+            " If the start of the line is in a string, don't change the indent
+            return -1
+        elseif synname =~? '\(Comment\|Todo\)'
+                    \ && line !~# '^\s*/\*'  " not /* opening line
+            if synname =~? "CommentML" " multi-line
+                if line !~# '^\s*\*' && getline(a:lnum - 1) =~# '^\s*/\*'
+                    " This is (hopefully) the line after a /*, and it has no
+                    " leader, so the correct indentation is that of the
+                    " previous line.
+                    return GetRustIndent(a:lnum - 1)
+                endif
+            endif
+            " If it's in a comment, let cindent take care of it now. This is
+            " for cases like "/*" where the next line should start " * ", not
+            " "* " as the code below would otherwise cause for module scope
+            " Fun fact: "  /*\n*\n*/" takes two calls to get right!
+            return cindent(a:lnum)
+        endif
+    endif
+
+    " cindent gets second and subsequent match patterns/struct members wrong,
+    " as it treats the comma as indicating an unfinished statement::
+    "
+    " match a {
+    "     b => c,
+    "         d => e,
+    "         f => g,
+    " };
+
+    " Search backwards for the previous non-empty line.
+    let prevlinenum = prevnonblank(a:lnum - 1)
+    let prevline = s:get_line_trimmed(prevlinenum)
+    while prevlinenum > 1 && prevline !~# '[^[:blank:]]'
+        let prevlinenum = prevnonblank(prevlinenum - 1)
+        let prevline = s:get_line_trimmed(prevlinenum)
+    endwhile
+
+    " A standalone '{', '}', or 'where'
+    let l:standalone_open = line =~# '\V\^\s\*{\s\*\$'
+    let l:standalone_close = line =~# '\V\^\s\*}\s\*\$'
+    let l:standalone_where = line =~# '\V\^\s\*where\s\*\$'
+    if l:standalone_open || l:standalone_close || l:standalone_where
+        " ToDo: we can search for more items than 'fn' and 'if'.
+        let [l:found_line, l:col, l:submatch] =
+                    \ searchpos('\<\(fn\)\|\(if\)\>', 'bnWp')
+        if l:found_line !=# 0
+            " Now we count the number of '{' and '}' in between the match
+            " locations and the current line (there is probably a better
+            " way to compute this).
+            let l:i = l:found_line
+            let l:search_line = strpart(getline(l:i), l:col - 1)
+            let l:opens = 0
+            let l:closes = 0
+            while l:i < a:lnum
+                let l:search_line2 = substitute(l:search_line, '\V{', '', 'g')
+                let l:opens += strlen(l:search_line) - strlen(l:search_line2)
+                let l:search_line3 = substitute(l:search_line2, '\V}', '', 'g')
+                let l:closes += strlen(l:search_line2) - strlen(l:search_line3)
+                let l:i += 1
+                let l:search_line = getline(l:i)
+            endwhile
+            if l:standalone_open || l:standalone_where
+                if l:opens ==# l:closes
+                    return indent(l:found_line)
+                endif
+            else
+                " Expect to find just one more close than an open
+                if l:opens ==# l:closes + 1
+                    return indent(l:found_line)
+                endif
+            endif
+        endif
+    endif
+
+    " A standalone 'where' adds a shift.
+    let l:standalone_prevline_where = prevline =~# '\V\^\s\*where\s\*\$'
+    if l:standalone_prevline_where
+        return indent(prevlinenum) + 4
+    endif
 
-	" Starting assumption: cindent (called at the end) will do it right
-	" normally. We just want to fix up a few cases.
-
-	let line = getline(a:lnum)
-
-	if has('syntax_items')
-		let synname = synIDattr(synID(a:lnum, 1, 1), "name")
-		if synname == "rustString"
-			" If the start of the line is in a string, don't change the indent
-			return -1
-		elseif synname =~ '\(Comment\|Todo\)'
-					\ && line !~ '^\s*/\*'  " not /* opening line
-			if synname =~ "CommentML" " multi-line
-				if line !~ '^\s*\*' && getline(a:lnum - 1) =~ '^\s*/\*'
-					" This is (hopefully) the line after a /*, and it has no
-					" leader, so the correct indentation is that of the
-					" previous line.
-					return GetRustIndent(a:lnum - 1)
-				endif
-			endif
-			" If it's in a comment, let cindent take care of it now. This is
-			" for cases like "/*" where the next line should start " * ", not
-			" "* " as the code below would otherwise cause for module scope
-			" Fun fact: "  /*\n*\n*/" takes two calls to get right!
-			return cindent(a:lnum)
-		endif
-	endif
-
-	" cindent gets second and subsequent match patterns/struct members wrong,
-	" as it treats the comma as indicating an unfinished statement::
-	"
-	" match a {
-	"     b => c,
-	"         d => e,
-	"         f => g,
-	" };
-
-	" Search backwards for the previous non-empty line.
-	let prevlinenum = prevnonblank(a:lnum - 1)
-	let prevline = s:get_line_trimmed(prevlinenum)
-	while prevlinenum > 1 && prevline !~ '[^[:blank:]]'
-		let prevlinenum = prevnonblank(prevlinenum - 1)
-		let prevline = s:get_line_trimmed(prevlinenum)
-	endwhile
-
-	" Handle where clauses nicely: subsequent values should line up nicely.
-	if prevline[len(prevline) - 1] == ","
-				\ && prevline =~# '^\s*where\s'
-		return indent(prevlinenum) + 6
-	endif
-
-	if prevline[len(prevline) - 1] == ","
-				\ && s:get_line_trimmed(a:lnum) !~ '^\s*[\[\]{}]'
-				\ && prevline !~ '^\s*fn\s'
-				\ && prevline !~ '([^()]\+,$'
-				\ && s:get_line_trimmed(a:lnum) !~ '^\s*\S\+\s*=>'
-		" Oh ho! The previous line ended in a comma! I bet cindent will try to
-		" take this too far... For now, let's normally use the previous line's
-		" indent.
-
-		" One case where this doesn't work out is where *this* line contains
-		" square or curly brackets; then we normally *do* want to be indenting
-		" further.
-		"
-		" Another case where we don't want to is one like a function
-		" definition with arguments spread over multiple lines:
-		"
-		" fn foo(baz: Baz,
-		"        baz: Baz) // <-- cindent gets this right by itself
-		"
-		" Another case is similar to the previous, except calling a function
-		" instead of defining it, or any conditional expression that leaves
-		" an open paren:
-		"
-		" foo(baz,
-		"     baz);
-		"
-		" if baz && (foo ||
-		"            bar) {
-		"
-		" Another case is when the current line is a new match arm.
-		"
-		" There are probably other cases where we don't want to do this as
-		" well. Add them as needed.
-		return indent(prevlinenum)
-	endif
-
-	if !has("patch-7.4.355")
-		" cindent before 7.4.355 doesn't do the module scope well at all; e.g.::
-		"
-		" static FOO : &'static [bool] = [
-		" true,
-		"	 false,
-		"	 false,
-		"	 true,
-		"	 ];
-		"
-		"	 uh oh, next statement is indented further!
-
-		" Note that this does *not* apply the line continuation pattern properly;
-		" that's too hard to do correctly for my liking at present, so I'll just
-		" start with these two main cases (square brackets and not returning to
-		" column zero)
-
-		call cursor(a:lnum, 1)
-		if searchpair('{\|(', '', '}\|)', 'nbW',
-					\ 's:is_string_comment(line("."), col("."))') == 0
-			if searchpair('\[', '', '\]', 'nbW',
-						\ 's:is_string_comment(line("."), col("."))') == 0
-				" Global scope, should be zero
-				return 0
-			else
-				" At the module scope, inside square brackets only
-				"if getline(a:lnum)[0] == ']' || search('\[', '', '\]', 'nW') == a:lnum
-				if line =~ "^\\s*]"
-					" It's the closing line, dedent it
-					return 0
-				else
-					return shiftwidth()
-				endif
-			endif
-		endif
-	endif
-
-	" Fall back on cindent, which does it mostly right
-	return cindent(a:lnum)
+    " Handle where clauses nicely: subsequent values should line up nicely.
+    if prevline[len(prevline) - 1] ==# ","
+                \ && prevline =~# '^\s*where\s'
+        return indent(prevlinenum) + 6
+    endif
+
+    let l:last_prevline_character = prevline[len(prevline) - 1]
+
+    " A line that ends with '.<expr>;' is probably an end of a long list
+    " of method operations.
+    if prevline =~# '\V\^\s\*.' && l:last_prevline_character ==# ';'
+        call cursor(a:lnum - 1, 1)
+        let l:scope_start = searchpair('{\|(', '', '}\|)', 'nbW',
+                    \ 's:is_string_comment(line("."), col("."))')
+        if l:scope_start != 0 && l:scope_start < a:lnum
+            return indent(l:scope_start) + 4
+        endif
+    endif
+
+    if l:last_prevline_character ==# ","
+                \ && s:get_line_trimmed(a:lnum) !~# '^\s*[\[\]{})]'
+                \ && prevline !~# '^\s*fn\s'
+                \ && prevline !~# '([^()]\+,$'
+                \ && s:get_line_trimmed(a:lnum) !~# '^\s*\S\+\s*=>'
+        " Oh ho! The previous line ended in a comma! I bet cindent will try to
+        " take this too far... For now, let's normally use the previous line's
+        " indent.
+
+        " One case where this doesn't work out is where *this* line contains
+        " square or curly brackets; then we normally *do* want to be indenting
+        " further.
+        "
+        " Another case where we don't want to is one like a function
+        " definition with arguments spread over multiple lines:
+        "
+        " fn foo(baz: Baz,
+        "        baz: Baz) // <-- cindent gets this right by itself
+        "
+        " Another case is similar to the previous, except calling a function
+        " instead of defining it, or any conditional expression that leaves
+        " an open paren:
+        "
+        " foo(baz,
+        "     baz);
+        "
+        " if baz && (foo ||
+        "            bar) {
+        "
+        " Another case is when the current line is a new match arm.
+        "
+        " There are probably other cases where we don't want to do this as
+        " well. Add them as needed.
+        return indent(prevlinenum)
+    endif
+
+    if !has("patch-7.4.355")
+        " cindent before 7.4.355 doesn't do the module scope well at all; e.g.::
+        "
+        " static FOO : &'static [bool] = [
+        " true,
+        "	 false,
+        "	 false,
+        "	 true,
+        "	 ];
+        "
+        "	 uh oh, next statement is indented further!
+
+        " Note that this does *not* apply the line continuation pattern properly;
+        " that's too hard to do correctly for my liking at present, so I'll just
+        " start with these two main cases (square brackets and not returning to
+        " column zero)
+
+        call cursor(a:lnum, 1)
+        if searchpair('{\|(', '', '}\|)', 'nbW',
+                    \ 's:is_string_comment(line("."), col("."))') == 0
+            if searchpair('\[', '', '\]', 'nbW',
+                        \ 's:is_string_comment(line("."), col("."))') == 0
+                " Global scope, should be zero
+                return 0
+            else
+                " At the module scope, inside square brackets only
+                "if getline(a:lnum)[0] == ']' || search('\[', '', '\]', 'nW') == a:lnum
+                if line =~# "^\\s*]"
+                    " It's the closing line, dedent it
+                    return 0
+                else
+                    return &shiftwidth
+                endif
+            endif
+        endif
+    endif
+
+    " Fall back on cindent, which does it mostly right
+    return cindent(a:lnum)
 endfunction
 
+" vint: -ProhibitAbbreviationOption
 let &cpo = s:save_cpo
 unlet s:save_cpo
+" vint: +ProhibitAbbreviationOption
+
+" vim: set et sw=4 sts=4 ts=8:
diff --git a/runtime/indent/scala.vim b/runtime/indent/scala.vim
index b5eba29543..c6aba4e388 100644
--- a/runtime/indent/scala.vim
+++ b/runtime/indent/scala.vim
@@ -4,6 +4,7 @@
 " Modifications By:     Derek Wyatt
 " URL:                  https://github.com/derekwyatt/vim-scala
 " Last Change:          2016 Aug 26
+"                       2023 Aug 28 by Vim Project (undo_indent)
 
 if exists("b:did_indent")
   finish
@@ -14,6 +15,8 @@ setlocal autoindent
 setlocal indentexpr=GetScalaIndent()
 setlocal indentkeys=0{,0},0),!^F,<>>,o,O,e,=case,<CR>
 
+let b:undo_indent = "setl ai< inde< indk<"
+
 if exists("*GetScalaIndent")
   finish
 endif
diff --git a/runtime/indent/solidity.vim b/runtime/indent/solidity.vim
index caed726c0a..55a07c015a 100644
--- a/runtime/indent/solidity.vim
+++ b/runtime/indent/solidity.vim
@@ -1,9 +1,11 @@
 " Vim indent file
-" Language: 		Solidity
-" Acknowledgement: 	Based off of vim-javascript
-" Maintainer: 		Cothi (jiungdev@gmail.com)
-" Original Author: 	tomlion (https://github.com/tomlion/vim-solidity)
-" Last Changed: 	2022 Sep 27
+" Language:		Solidity
+" Maintainer:		Cothi (jiungdev@gmail.com)
+" Original Author:	tomlion (https://github.com/tomlion/vim-solidity)
+" Last Change:		2022 Sep 27
+" 			2023 Aug 22 Vim Project (undo_indent)
+"
+" Acknowledgement: Based off of vim-javascript
 "
 " 0. Initialization {{{1
 " =================
@@ -20,6 +22,8 @@ setlocal nosmartindent
 setlocal indentexpr=GetSolidityIndent()
 setlocal indentkeys=0{,0},0),0],0\,,!^F,o,O,e
 
+let b:undo_indent = "setlocal indentexpr< indentkeys< smartindent<"
+
 " Only define the function once.
 if exists("*GetSolidityIndent")
   finish
diff --git a/runtime/indent/systemverilog.vim b/runtime/indent/systemverilog.vim
index a5f4d5b90d..42a05a03aa 100644
--- a/runtime/indent/systemverilog.vim
+++ b/runtime/indent/systemverilog.vim
@@ -78,10 +78,10 @@ function SystemVerilogIndent()
   " Multiple-line comment count
   if curr_line =~ '^\s*/\*' && curr_line !~ '/\*.\{-}\*/'
     let s:multiple_comment += 1
-    if vverb | echom vverb_str "Start of multiple-line commnt" | endif
+    if vverb | echom vverb_str "Start of multiple-line comment" | endif
   elseif curr_line =~ '\*/\s*$' && curr_line !~ '/\*.\{-}\*/'
     let s:multiple_comment -= 1
-    if vverb | echom vverb_str "End of multiple-line commnt" | endif
+    if vverb | echom vverb_str "End of multiple-line comment" | endif
     return ind
   endif
   " Maintain indentation during commenting.
diff --git a/runtime/indent/testdir/dts.in b/runtime/indent/testdir/dts.in
new file mode 100644
index 0000000000..64e56e9017
--- /dev/null
+++ b/runtime/indent/testdir/dts.in
@@ -0,0 +1,46 @@
+/* vim: set ft=dts noet sw=8 : */
+
+/* START_INDENT */
+/dts-v1/;
+#include <dt-bindings/pinctrl/pinctrl-imx6q.h>
+	#include "imx6qdl.dtsi"
+#include "imx6qdl-someboard.dtsi"
+
+	/delete-node/ &{/memory@10000000};
+
+	/ {
+compatible = "some,board";
+/delete-node/ memory;
+
+	chosen {
+environment = &{usdhc4/partitions/partition@0};
+};
+}
+
+	&iomuxc {
+pinctrl-names = "default";
+pinctrl-0 = <&pinctrl_hog>;
+
+pinctrl_gpiohog: gpiohoggrp {
+fsl,pins = <
+MX6QDL_PAD_GPIO_9__GPIO1_IO09           0x130b0
+MX6QDL_PAD_GPIO_17__GPIO7_IO12          0x130b0
+>;
+};
+}
+
+&usdhc4 {
+partitions {
+compatible = "fixed-partitions";
+
+partition@0 {
+label = "environment";
+reg = <0x0 0xe0000>;
+};
+};
+};
+
+&{/aliases} {
+usb0 = &usb;
+};
+/* END_INDENT */
diff --git a/runtime/indent/testdir/dts.ok b/runtime/indent/testdir/dts.ok
new file mode 100644
index 0000000000..d249766fd4
--- /dev/null
+++ b/runtime/indent/testdir/dts.ok
@@ -0,0 +1,46 @@
+/* vim: set ft=dts noet sw=8 : */
+
+/* START_INDENT */
+/dts-v1/;
+#include <dt-bindings/pinctrl/pinctrl-imx6q.h>
+#include "imx6qdl.dtsi"
+#include "imx6qdl-someboard.dtsi"
+
+/delete-node/ &{/memory@10000000};
+
+/ {
+	compatible = "some,board";
+	/delete-node/ memory;
+
+	chosen {
+		environment = &{usdhc4/partitions/partition@0};
+	};
+}
+
+&iomuxc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_hog>;
+
+	pinctrl_gpiohog: gpiohoggrp {
+		fsl,pins = <
+			MX6QDL_PAD_GPIO_9__GPIO1_IO09           0x130b0
+			MX6QDL_PAD_GPIO_17__GPIO7_IO12          0x130b0
+		>;
+	};
+}
+
+&usdhc4 {
+	partitions {
+		compatible = "fixed-partitions";
+
+		partition@0 {
+			label = "environment";
+			reg = <0x0 0xe0000>;
+		};
+	};
+};
+
+&{/aliases} {
+	usb0 = &usb;
+};
+/* END_INDENT */
diff --git a/runtime/indent/testdir/rapid.in b/runtime/indent/testdir/rapid.in
new file mode 100644
index 0000000000..515912ed89
--- /dev/null
+++ b/runtime/indent/testdir/rapid.in
@@ -0,0 +1,266 @@
+! vim: set ft=rapid :
+
+! START_INDENT
+
+%%%
+  VERSION:1
+  LANGUAGE:ENGLISH
+%%%
+  
+module LowerCaseModule
+
+task pers num n1 := 0;
+local pers num n2 := 1;
+var bool b1 := false;
+var intnum i1;
+
+! put some stuff in those strings that may confuse indentation
+const string st1 := "endmodule ("; 
+pers string st_Appl_Info{3,3}:=[
+[
+"["
+,
+"default"
+,
+"case"
+],
+[
+"else"
+,
+"then"
+,
+"endif"
+],
+[
+"do"
+,
+"}"
+,
+")"
+],
+];
+
+pers tooldata tTool1:=[TRUE, 
+[
+[97.4, 0, 223.1], 
+[0.924, 0, 0.383 ,0]
+], 
+[5, 
+[23, 0, 75], 
+[1, 0, 0, 0], 0, 0, 0
+]
+];
+const robtarget p1:=[ 
+[600, 500, 225.3], 
+[1, 0, 0, 0], 
+[1, 1, 0, 0], 
+[ 11, 12.3, 9E9, 9E9, 9E9, 9E9]
+];
+
+record myRec
+num nRecNum1
+bool bRecBool1
+endrecord
+
+proc proc1(num n1,
+num n2)
+var string st1;
+n1 := n1+1;
+MoveJSync p1, vmax, z30, tool1, "proc2";
+backward
+MoveJSync p1, v100, fine, tool1, "proc2";
+undo
+n1 := n1-1;
+error
+trynext;
+endproc
+
+func num nFunc1(
+switch s1
+|switch s2
+,num n1
+,bool b1)
+var num nVar;
+if not Present(s1) return;
+if Present(s1) then
+Incr n1;'
+elseif Present(s2) then
+b1:=false;
+else
+while n1>0 do
+Decr n1;
+test n1
+
+case 1:
+test1;
+case 2:
+test2;
+default:
+WaitUntil false;
+endtest
+endwhile
+endif
+for i from 1 to 10 step 2 do
+for j from 1 to 10 do
+st_Appl_Info{i,j} := "";
+endfor
+endfor
+!     return 1;
+return 0;
+error
+return -1;
+endfunc
+
+trap Trap1
+Reset do1;
+endtrap
+
+endmodule
+
+MODULE UpperCaseModule(SYSMODULE,NOSTEPIN)
+TASK pers num n1 := 0;
+LOCAL pers num n2 := 1;
+VAR bool b1 := false;
+VAR intnum i1;
+
+LOCAL FUNC num nFunc1(
+switch s1
+|switch s2
+,num n1
+,bool b1)
+VAR num nVar;
+IF NOT PRESENT(s1) RETURN;
+IF PRESENT(s1) THEN
+INCR n1;'
+ELSEIF PRESENT(s2) THEN
+b1:=FALSE;
+ELSE
+WHILE n1>0 DO
+DECR n1;
+TEST n1
+
+CASE 1:
+test1;
+CASE 2:
+test2;
+DEFAULT:
+WAITUNTIL FALSE;
+ENDTEST
+ENDWHILE
+ENDIF
+FOR i FROM 1 TO 10 STEP 2 DO
+FOR j FROM 1 TO 10 DO
+st_Appl_Info{i,j} := "";
+ENDFOR
+ENDFOR
+!     RETURN 1;
+RETURN 0;
+ERROR
+RETURN -1;
+ENDFUNC
+
+TRAP Trap1
+Reset do1;
+ENDTRAP
+
+ENDMODULE
+
+Module MixedCaseModule(SysModule)
+Task pers num n1 := 0;
+Local pers num n2 := 1;
+Var bool b1 := false;
+Var intnum i1;
+
+Task Func num nFunc1(
+switch s1
+|switch s2
+,num n1
+,bool b1)
+Var num nVar;
+If Not Present(s1) Return;
+If Present(s1) Then
+Incr n1;'
+ElseIf Present(s2) Then
+b1:=false;
+Else
+While n1>0 Do
+Decr n1;
+Test n1
+
+Case 1:
+test1;
+Case 2:
+test2;
+Default:
+WaitUntil false;
+EndTest
+EndWhile
+EndIf
+For i From 1 To 10 Step 2 Do
+For j From 1 To 10 Do
+st_Appl_Info{i,j} := "";
+EndFor
+EndFor
+!     Return 1;
+Return 0;
+Error
+Return -1;
+EndFunc
+
+Trap Trap1
+Reset do1;
+EndTrap
+
+EndModule
+
+! END_INDENT
+
+! START_INDENT
+! INDENT_EXE let g:rapidSpaceIndent = 0
+! INDENT_EXE set shiftwidth=4
+
+proc bla()
+var num i;
+Incr i;
+endproc
+
+! END_INDENT
+
+! START_INDENT
+! INDENT_EXE let g:rapidCommentIndent = 1
+!
+proc bla()
+! indent this first column comment because of g:rapidCommentIndent=1
+endproc
+! END_INDENT
+
+! START_INDENT
+! INDENT_EXE let g:rapidNewStyleIndent = 1
+pers string st_Appl_Info{3,3}:=
+[
+[
+"["
+,
+"default"
+,
+"case"
+]
+,
+[
+"else"
+,
+"then"
+,
+"endif"
+]
+,
+[
+"do"
+,
+"}"
+,
+")"
+]
+,
+];
+! END_INDENT
diff --git a/runtime/indent/testdir/rapid.ok b/runtime/indent/testdir/rapid.ok
new file mode 100644
index 0000000000..ce336821c4
--- /dev/null
+++ b/runtime/indent/testdir/rapid.ok
@@ -0,0 +1,266 @@
+! vim: set ft=rapid :
+
+! START_INDENT
+
+%%%
+VERSION:1
+LANGUAGE:ENGLISH
+%%%
+
+module LowerCaseModule
+
+  task pers num n1 := 0;
+  local pers num n2 := 1;
+  var bool b1 := false;
+  var intnum i1;
+
+! put some stuff in those strings that may confuse indentation
+  const string st1 := "endmodule ("; 
+  pers string st_Appl_Info{3,3}:=[
+          [
+                  "["
+                  ,
+                  "default"
+                  ,
+                  "case"
+                  ],
+          [
+                  "else"
+                  ,
+                  "then"
+                  ,
+                  "endif"
+                  ],
+          [
+                  "do"
+                  ,
+                  "}"
+                  ,
+                  ")"
+                  ],
+          ];
+
+  pers tooldata tTool1:=[TRUE, 
+          [
+                  [97.4, 0, 223.1], 
+                  [0.924, 0, 0.383 ,0]
+                  ], 
+          [5, 
+                  [23, 0, 75], 
+                  [1, 0, 0, 0], 0, 0, 0
+                  ]
+          ];
+  const robtarget p1:=[ 
+          [600, 500, 225.3], 
+          [1, 0, 0, 0], 
+          [1, 1, 0, 0], 
+          [ 11, 12.3, 9E9, 9E9, 9E9, 9E9]
+          ];
+
+  record myRec
+    num nRecNum1
+    bool bRecBool1
+  endrecord
+
+  proc proc1(num n1,
+            num n2)
+    var string st1;
+    n1 := n1+1;
+    MoveJSync p1, vmax, z30, tool1, "proc2";
+  backward
+    MoveJSync p1, v100, fine, tool1, "proc2";
+  undo
+    n1 := n1-1;
+  error
+    trynext;
+  endproc
+
+  func num nFunc1(
+            switch s1
+            |switch s2
+            ,num n1
+            ,bool b1)
+    var num nVar;
+    if not Present(s1) return;
+    if Present(s1) then
+      Incr n1;'
+    elseif Present(s2) then
+      b1:=false;
+    else
+      while n1>0 do
+        Decr n1;
+        test n1
+
+        case 1:
+          test1;
+        case 2:
+          test2;
+        default:
+          WaitUntil false;
+        endtest
+      endwhile
+    endif
+    for i from 1 to 10 step 2 do
+      for j from 1 to 10 do
+        st_Appl_Info{i,j} := "";
+      endfor
+    endfor
+!     return 1;
+    return 0;
+  error
+    return -1;
+  endfunc
+
+  trap Trap1
+    Reset do1;
+  endtrap
+
+endmodule
+
+MODULE UpperCaseModule(SYSMODULE,NOSTEPIN)
+  TASK pers num n1 := 0;
+  LOCAL pers num n2 := 1;
+  VAR bool b1 := false;
+  VAR intnum i1;
+
+  LOCAL FUNC num nFunc1(
+            switch s1
+            |switch s2
+            ,num n1
+            ,bool b1)
+    VAR num nVar;
+    IF NOT PRESENT(s1) RETURN;
+    IF PRESENT(s1) THEN
+      INCR n1;'
+    ELSEIF PRESENT(s2) THEN
+      b1:=FALSE;
+    ELSE
+      WHILE n1>0 DO
+        DECR n1;
+        TEST n1
+
+        CASE 1:
+          test1;
+        CASE 2:
+          test2;
+        DEFAULT:
+          WAITUNTIL FALSE;
+        ENDTEST
+      ENDWHILE
+    ENDIF
+    FOR i FROM 1 TO 10 STEP 2 DO
+      FOR j FROM 1 TO 10 DO
+        st_Appl_Info{i,j} := "";
+      ENDFOR
+    ENDFOR
+!     RETURN 1;
+    RETURN 0;
+  ERROR
+    RETURN -1;
+  ENDFUNC
+
+  TRAP Trap1
+    Reset do1;
+  ENDTRAP
+
+ENDMODULE
+
+Module MixedCaseModule(SysModule)
+  Task pers num n1 := 0;
+  Local pers num n2 := 1;
+  Var bool b1 := false;
+  Var intnum i1;
+
+  Task Func num nFunc1(
+            switch s1
+            |switch s2
+            ,num n1
+            ,bool b1)
+    Var num nVar;
+    If Not Present(s1) Return;
+    If Present(s1) Then
+      Incr n1;'
+    ElseIf Present(s2) Then
+      b1:=false;
+    Else
+      While n1>0 Do
+        Decr n1;
+        Test n1
+
+        Case 1:
+          test1;
+        Case 2:
+          test2;
+        Default:
+          WaitUntil false;
+        EndTest
+      EndWhile
+    EndIf
+    For i From 1 To 10 Step 2 Do
+      For j From 1 To 10 Do
+        st_Appl_Info{i,j} := "";
+      EndFor
+    EndFor
+!     Return 1;
+    Return 0;
+  Error
+    Return -1;
+  EndFunc
+
+  Trap Trap1
+    Reset do1;
+  EndTrap
+
+EndModule
+
+! END_INDENT
+
+! START_INDENT
+! INDENT_EXE let g:rapidSpaceIndent = 0
+! INDENT_EXE set shiftwidth=4
+
+proc bla()
+    var num i;
+    Incr i;
+endproc
+
+! END_INDENT
+
+! START_INDENT
+! INDENT_EXE let g:rapidCommentIndent = 1
+!
+proc bla()
+    ! indent this first column comment because of g:rapidCommentIndent=1
+endproc
+! END_INDENT
+
+! START_INDENT
+! INDENT_EXE let g:rapidNewStyleIndent = 1
+pers string st_Appl_Info{3,3}:=
+[
+                [
+                                "["
+                                ,
+                                "default"
+                                ,
+                                "case"
+                ]
+                ,
+                [
+                                "else"
+                                ,
+                                "then"
+                                ,
+                                "endif"
+                ]
+                ,
+                [
+                                "do"
+                                ,
+                                "}"
+                                ,
+                                ")"
+                ]
+                ,
+];
+! END_INDENT
diff --git a/runtime/indent/testdir/runtest.vim b/runtime/indent/testdir/runtest.vim
index fa4e16e381..882a140a8d 100644
--- a/runtime/indent/testdir/runtest.vim
+++ b/runtime/indent/testdir/runtest.vim
@@ -12,6 +12,7 @@ set nowrapscan
 set report=9999
 set modeline
 set debug=throw
+set nomore
 
 au! SwapExists * call HandleSwapExists()
 func HandleSwapExists()
diff --git a/runtime/indent/tex.vim b/runtime/indent/tex.vim
index d356ba905b..68d13fb116 100644
--- a/runtime/indent/tex.vim
+++ b/runtime/indent/tex.vim
@@ -67,7 +67,8 @@
 "               2020/04/26 by Yichao Zhou <broken.zhou AT gmail.com>
 "               (*) Fix a bug related to \[ & \].  Thanks Manuel Boni for
 "               reporting.
-"
+"               2023/08/28 by Vim Project
+"               (*) Set b:undo_indent.
 " }}}
 
 " Document: {{{
@@ -167,6 +168,7 @@ setlocal indentexpr=GetTeXIndent()
 setlocal indentkeys&
 exec 'setlocal indentkeys+=[,(,{,),},],\&' . substitute(g:tex_items, '^\|\(\\|\)', ',=', 'g')
 let g:tex_items = '^\s*' . substitute(g:tex_items, '^\(\^\\s\*\)*', '', '')
+let b:undo_indent = "setlocal autoindent< indentexpr< indentkeys< smartindent<"
 " }}}
 
 function! GetTeXIndent() " {{{
diff --git a/runtime/indent/typescript.vim b/runtime/indent/typescript.vim
index e899f83d0f..e26750b8aa 100644
--- a/runtime/indent/typescript.vim
+++ b/runtime/indent/typescript.vim
@@ -2,6 +2,7 @@
 " Language: TypeScript
 " Maintainer: See https://github.com/HerringtonDarkholme/yats.vim
 " Last Change: 2019 Oct 18
+"              2023 Aug 28 by Vim Project (undo_indent)
 " Acknowledgement: Based off of vim-ruby maintained by Nikolai Weibull http://vim-ruby.rubyforge.org
 
 " 0. Initialization {{{1
@@ -20,6 +21,8 @@ setlocal indentexpr=GetTypescriptIndent()
 setlocal formatexpr=Fixedgq(v:lnum,v:count)
 setlocal indentkeys=0{,0},0),0],0\,,!^F,o,O,e
 
+let b:undo_indent = "setlocal formatexpr< indentexpr< indentkeys< smartindent<"
+
 " Only define the function once.
 if exists("*GetTypescriptIndent")
   finish
diff --git a/runtime/indent/typescriptreact.vim b/runtime/indent/typescriptreact.vim
new file mode 100644
index 0000000000..052bddddbd
--- /dev/null
+++ b/runtime/indent/typescriptreact.vim
@@ -0,0 +1,2 @@
+" Placeholder for backwards compatilibity: .tsx used to stand for TypeScript.
+runtime! indent/typescript.vim
diff --git a/runtime/indent/verilog.vim b/runtime/indent/verilog.vim
index e81197c3b4..377615c348 100644
--- a/runtime/indent/verilog.vim
+++ b/runtime/indent/verilog.vim
@@ -1,6 +1,7 @@
 " Language:     Verilog HDL
 " Maintainer:	Chih-Tsun Huang <cthuang@cs.nthu.edu.tw>
 " Last Change:	2017 Aug 25 by Chih-Tsun Huang
+" 		2023 Aug 28 by Vim Project (undo_indent)
 " URL:		    http://www.cs.nthu.edu.tw/~cthuang/vim/indent/verilog.vim
 "
 " Credits:
@@ -28,6 +29,8 @@ setlocal indentkeys+==endmodule,=endfunction,=endtask,=endspecify
 setlocal indentkeys+==endconfig,=endgenerate,=endprimitive,=endtable
 setlocal indentkeys+==`else,=`elsif,=`endif
 
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
 " Only define the function once.
 if exists("*GetVerilogIndent")
   finish
diff --git a/runtime/indent/vhdl.vim b/runtime/indent/vhdl.vim
index ad318066f4..b01d1156e9 100644
--- a/runtime/indent/vhdl.vim
+++ b/runtime/indent/vhdl.vim
@@ -3,6 +3,7 @@
 " Maintainer:  Gerald Lai <laigera+vim?gmail.com>
 " Version:     1.62
 " Last Change: 2017 Oct 17
+"              2023 Aug 28 by Vim Project (undo_indent)
 " URL:         http://www.vim.org/scripts/script.php?script_id=1450
 
 " only load this indent file when no other was loaded
@@ -19,6 +20,8 @@ setlocal indentkeys+==~if,=~then,=~elsif,=~else
 setlocal indentkeys+==~case,=~loop,=~for,=~generate,=~record,=~units,=~process,=~block,=~function,=~component,=~procedure
 setlocal indentkeys+==~architecture,=~configuration,=~entity,=~package
 
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
 " constants
 " not a comment
 let s:NC = '\%(--.*\)\@<!'
diff --git a/runtime/indent/vim.vim b/runtime/indent/vim.vim
index 3beb70d255..b2fb57f51f 100644
--- a/runtime/indent/vim.vim
+++ b/runtime/indent/vim.vim
@@ -1,7 +1,8 @@
 " Vim indent file
 " Language:	Vim script
-" Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2022 Jun 24
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
diff --git a/runtime/indent/wast.vim b/runtime/indent/wat.vim
index 1be234b6e9..08997f1a98 100644
--- a/runtime/indent/wast.vim
+++ b/runtime/indent/wat.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:     WebAssembly
 " Maintainer:   rhysd <lin90162@yahoo.co.jp>
-" Last Change:  Jul 29, 2018
+" Last Change:  Nov 14, 2023
 " For bugs, patches and license go to https://github.com/rhysd/vim-wasm
 
 if exists("b:did_indent")
diff --git a/runtime/indent/xhtml.vim b/runtime/indent/xhtml.vim
index 2197b7901c..e5c9cc307f 100644
--- a/runtime/indent/xhtml.vim
+++ b/runtime/indent/xhtml.vim
@@ -1,7 +1,8 @@
 " Vim indent file
 " Language:	XHTML
-" Maintainer:	Bram Moolenaar <Bram@vim.org> (for now)
-" Last Change:	2005 Jun 24
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
diff --git a/runtime/indent/zimbu.vim b/runtime/indent/zimbu.vim
index 0e6e2ab1d1..08369e42e5 100644
--- a/runtime/indent/zimbu.vim
+++ b/runtime/indent/zimbu.vim
@@ -1,7 +1,8 @@
 " Vim indent file
 " Language:	Zimbu
-" Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2021 Sep 26
+" Maintainer:	The Vim Project <https://github.com/vim/vim>
+" Last Change:	2023 Aug 10
+" Former Maintainer:	Bram Moolenaar <Bram@vim.org>
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")