vim-patch:9.1.0058: Cannot map Super Keys in GTK UI (#27204)

Problem:  Cannot map Super Keys in GTK UI
          (Casey Tucker)
Solution: Enable Super Key mappings in GTK using <D-Key>
          (Casey Tucker)

As a developer who works in both Mac and Linux using the same keyboard,
it can be frustrating having to remember different key combinations or
having to rely on system utilities to remap keys.

This change allows `<D-z>` `<D-x>` `<D-c>` `<D-v>` etc. to be recognized
by the `map` commands, along with the `<D-S-...>` shifted variants.

```vimrc
if has('gui_gtk')
	nnoremap  <D-z>    u
	nnoremap  <D-S-Z>  <C-r>
	vnoremap  <D-x>    "+d
	vnoremap  <D-c>    "+y
	cnoremap  <D-v>    <C-R>+
	inoremap  <D-v>    <C-o>"+gP
	nnoremap  <D-v>    "+P
	vnoremap  <D-v>    "-d"+P
	nnoremap  <D-s>    :w<CR>
	inoremap  <D-s>    <C-o>:w<CR>
	nnoremap  <D-w>    :q<CR>
	nnoremap  <D-q>    :qa<CR>
	nnoremap  <D-t>    :tabe<CR>
	nnoremap  <D-S-T>  :vs#<CR><C-w>T
	nnoremap  <D-a>    ggVG
	vnoremap  <D-a>    <ESC>ggVG
	inoremap  <D-a>    <ESC>ggVG
	nnoremap  <D-f>    /
	nnoremap  <D-g>    n
	nnoremap  <D-S-G>  N
	vnoremap  <D-x>    "+x
endif
```

closes: vim/vim#12698

https://github.com/vim/vim/commit/92e90a1e102825aa9149262cacfc991264db05df

Co-authored-by: Casey Tucker <dctucker@hotmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/nvim/eval.lua b/src/nvim/eval.lua
index 22c208426c..9f50fd1758 100644
--- a/src/nvim/eval.lua
+++ b/src/nvim/eval.lua
@@ -3461,7 +3461,7 @@ M.funcs = {
       	32	mouse double click
       	64	mouse triple click
       	96	mouse quadruple click (== 32 + 64)
-      	128	command (Macintosh only)
+      	128	command (Mac) or super
       Only the modifiers that have not been included in the
       character itself are obtained.  Thus Shift-a results in "A"
       without a modifier.  Returns 0 if no modifiers are used.