vim-patch:8.2.0807: cannot easily restore a mapping

Problem:    Cannot easily restore a mapping.
Solution:   Add mapset().
https://github.com/vim/vim/commit/4c9243f9fb708c9010867d3cc8e928f36b58509a

Use MapArgument to reduce number of arguments of map_add().

N/A patches for version.c:

vim-patch:8.2.0809: build failure with small features

Problem:    Build failure with small features. (Tony Mechelynck)
Solution:   Move "expr" inside #ifdef.
https://github.com/vim/vim/commit/5a80f8ad5dc0b2cc63400255dcf3c63f6c1a2ef9

1 files changed, 38 insertions, 13 deletions

diff --git a/src/nvim/testdir/test_maparg.vim b/src/nvim/testdir/test_maparg.vim
index f9429a8020..ec9af3d825 100644
--- a/src/nvim/testdir/test_maparg.vim
+++ b/src/nvim/testdir/test_maparg.vim
@@ -1,12 +1,12 @@
-" Tests for maparg().
+" Tests for maparg(), mapcheck() and mapset().
 " Also test utf8 map with a 0x80 byte.
 " Also test mapcheck()
 
-function s:SID()     
+func s:SID()     
   return str2nr(matchstr(expand('<sfile>'), '<SNR>\zs\d\+\ze_SID$'))
-endfun
+endfunc
 
-function Test_maparg()
+funct Test_maparg()
   new
   set cpo-=<
   set encoding=utf8
@@ -17,24 +17,24 @@ function Test_maparg()
   vnoremap <script> <buffer> <expr> <silent> bar isbar
   call assert_equal("is<F4>foo", maparg('foo<C-V>'))
   call assert_equal({'silent': 0, 'noremap': 0, 'script': 0, 'lhs': 'foo<C-V>',
-        \ 'mode': ' ', 'nowait': 0, 'expr': 0, 'sid': sid, 'lnum': lnum + 1,
-        \ 'rhs': 'is<F4>foo', 'buffer': 0},
-        \ maparg('foo<C-V>', '', 0, 1))
+        \ 'mode': ' ', 'nowait': 0, 'expr': 0, 'sid': sid, 'lnum': lnum + 1, 
+	\ 'simplified': 1, 'rhs': 'is<F4>foo', 'buffer': 0},
+	\ maparg('foo<C-V>', '', 0, 1))
   call assert_equal({'silent': 1, 'noremap': 1, 'script': 1, 'lhs': 'bar', 'mode': 'v',
         \ 'nowait': 0, 'expr': 1, 'sid': sid, 'lnum': lnum + 2,
-        \ 'rhs': 'isbar', 'buffer': 1},
+	\ 'simplified': 0, 'rhs': 'isbar', 'buffer': 1},
         \ 'bar'->maparg('', 0, 1))
   let lnum = expand('<sflnum>')
   map <buffer> <nowait> foo bar
   call assert_equal({'silent': 0, 'noremap': 0, 'script': 0, 'lhs': 'foo', 'mode': ' ',
         \ 'nowait': 1, 'expr': 0, 'sid': sid, 'lnum': lnum + 1, 'rhs': 'bar',
-        \ 'buffer': 1},
+	\ 'simplified': 0, 'buffer': 1},
         \ maparg('foo', '', 0, 1))
   let lnum = expand('<sflnum>')
   tmap baz foo
   call assert_equal({'silent': 0, 'noremap': 0, 'script': 0, 'lhs': 'baz', 'mode': 't',
         \ 'nowait': 0, 'expr': 0, 'sid': sid, 'lnum': lnum + 1, 'rhs': 'foo',
-        \ 'buffer': 0},
+	\ 'simplified': 0, 'buffer': 0},
         \ maparg('baz', 't', 0, 1))
 
   map abc x<char-114>x
@@ -89,7 +89,7 @@ function Test_maparg()
   let d = maparg('esc', 'i', 1, 1)
   call assert_equal(['esc', "\<C-V>\<C-V>\<Esc>", '!'], [d.lhs, d.rhs, d.mode])
   abclear
-endfunction
+endfunc
 
 func Test_mapcheck()
   call assert_equal('', mapcheck('a'))
@@ -130,7 +130,7 @@ func Test_mapcheck()
   unabbr ab
 endfunc
 
-function Test_range_map()
+func Test_range_map()
   new
   " Outside of the range, minimum
   inoremap <Char-0x1040> a
@@ -145,6 +145,31 @@ function Test_range_map()
   inoremap <Char-0xf040> d
   execute "normal a\uf040\<Esc>"
   call assert_equal("abcd", getline(1))
-endfunction
+endfunc
+
+func One_mapset_test(keys)
+  exe 'nnoremap ' .. a:keys .. ' original<CR>'
+  let orig = maparg(a:keys, 'n', 0, 1)
+  call assert_equal(a:keys, orig.lhs)
+  call assert_equal('original<CR>', orig.rhs)
+  call assert_equal('n', orig.mode)
+
+  exe 'nunmap ' .. a:keys
+  let d = maparg(a:keys, 'n', 0, 1)
+  call assert_equal({}, d)
+
+  call mapset('n', 0, orig)
+  let d = maparg(a:keys, 'n', 0, 1)
+  call assert_equal(a:keys, d.lhs)
+  call assert_equal('original<CR>', d.rhs)
+  call assert_equal('n', d.mode)
+
+  exe 'nunmap ' .. a:keys
+endfunc
+
+func Test_mapset()
+  call One_mapset_test('K')
+  call One_mapset_test('<F3>')
+endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab