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

1 files changed, 20 insertions, 0 deletions

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:')