vim-patch:8.2.4924: maparg() may return a string that cannot be reused

Problem:    maparg() may return a string that cannot be reused.
Solution:   use msg_outtrans_special() instead of str2special().
            (closes vim/vim#10384)
https://github.com/vim/vim/commit/0519ce00394474055bd58c089ea90a19986443eb

3 files changed, 41 insertions, 0 deletions

diff --git a/src/nvim/testdir/test_maparg.vim b/src/nvim/testdir/test_maparg.vim
index cebde89996..f9429a8020 100644
--- a/src/nvim/testdir/test_maparg.vim
+++ b/src/nvim/testdir/test_maparg.vim
@@ -42,6 +42,20 @@ function Test_maparg()
   map abc y<S-char-114>y
   call assert_equal("yRy", maparg('abc'))
 
+  " character with K_SPECIAL byte
+  nmap abc …
+  call assert_equal('…', maparg('abc'))
+
+  " modified character with K_SPECIAL byte
+  nmap abc <M-…>
+  call assert_equal('<M-…>', maparg('abc'))
+
+  " illegal bytes
+  let str = ":\x7f:\x80:\x90:\xd0:"
+  exe 'nmap abc ' .. str
+  call assert_equal(str, maparg('abc'))
+  unlet str
+
   omap { w
   let d = maparg('{', 'o', 0, 1)
   call assert_equal(['{', 'w', 'o'], [d.lhs, d.rhs, d.mode])
diff --git a/src/nvim/testdir/test_mapping.vim b/src/nvim/testdir/test_mapping.vim
index b5158295b4..995511cddf 100644
--- a/src/nvim/testdir/test_mapping.vim
+++ b/src/nvim/testdir/test_mapping.vim
@@ -488,6 +488,13 @@ func Test_list_mappings()
   call assert_equal(['n  <M-…>         foo'],
         \ execute('nmap <M-…>')->trim()->split("\n"))
 
+  " illegal bytes
+  let str = ":\x7f:\x80:\x90:\xd0:"
+  exe 'nmap foo ' .. str
+  call assert_equal(['n  foo           ' .. strtrans(str)],
+        \ execute('nmap foo')->trim()->split("\n"))
+  unlet str
+
   " map to CTRL-V
   exe "nmap ,k \<C-V>"
   call assert_equal(['n  ,k            <Nop>'],
diff --git a/src/nvim/testdir/test_options.vim b/src/nvim/testdir/test_options.vim
index d16d89ec2e..8f67b1732e 100644
--- a/src/nvim/testdir/test_options.vim
+++ b/src/nvim/testdir/test_options.vim
@@ -31,6 +31,26 @@ func Test_isfname()
   set isfname&
 endfunc
 
+" Test for getting the value of 'pastetoggle'
+func Test_pastetoggle()
+  " character with K_SPECIAL byte
+  let &pastetoggle = '…'
+  call assert_equal('…', &pastetoggle)
+  call assert_equal("\n  pastetoggle=…", execute('set pastetoggle?'))
+
+  " modified character with K_SPECIAL byte
+  let &pastetoggle = '<M-…>'
+  call assert_equal('<M-…>', &pastetoggle)
+  call assert_equal("\n  pastetoggle=<M-…>", execute('set pastetoggle?'))
+
+  " illegal bytes
+  let str = ":\x7f:\x80:\x90:\xd0:"
+  let &pastetoggle = str
+  call assert_equal(str, &pastetoggle)
+  call assert_equal("\n  pastetoggle=" .. strtrans(str), execute('set pastetoggle?'))
+  unlet str
+endfunc
+
 func Test_wildchar()
   " Empty 'wildchar' used to access invalid memory.
   call assert_fails('set wildchar=', 'E521:')