patch 9.1.0058: Cannot map Super Keys in GTK UIv9.1.0058

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: #12698

Signed-off-by: Casey Tucker <dctucker@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

1 files changed, 17 insertions, 7 deletions

diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index 7d4d53048d..cf83ffc0c8 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1,4 +1,4 @@
-*map.txt*       For Vim version 9.1.  Last change: 2024 Jan 04
+*map.txt*       For Vim version 9.1.  Last change: 2024 Jan 25
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -21,9 +21,10 @@ manual.
    1.9 Using mappings				|map-typing|
    1.10 Mapping alt-keys			|:map-alt-keys|
    1.11 Mapping meta-keys			|:map-meta-keys|
-   1.12 Mapping in modifyOtherKeys mode		|modifyOtherKeys|
-   1.13 Mapping with Kitty keyboard protocol	|kitty-keyboard-protocol|
-   1.14 Mapping an operator			|:map-operator|
+   1.12 Mapping super-keys or command keys	|:map-super-keys|
+   1.13 Mapping in modifyOtherKeys mode		|modifyOtherKeys|
+   1.14 Mapping with Kitty keyboard protocol	|kitty-keyboard-protocol|
+   1.15 Mapping an operator			|:map-operator|
 2. Abbreviations		|abbreviations|
 3. Local mappings and functions	|script-local|
 4. User-defined commands	|user-commands|
@@ -985,8 +986,17 @@ For the Meta modifier the "T" character is used.  For example, to map Meta-b
 in Insert mode: >
 	:imap <T-b> terrible
 
+1.12 MAPPING SUPER-KEYS or COMMAND-KEYS		*:map-super-keys* *:map-cmd-key*
 
-1.12 MAPPING IN modifyOtherKeys mode			*modifyOtherKeys*
+The Super modifier is available in GUI mode (when |gui_running| is 1) for
+GVim on Linux and MacVim on Mac OS. If you're on a Mac, this represents the
+Command key, on Linux with the GTK GUI it represents the Super key.
+The character "D" is used for the Super / Command modifier.
+
+For example, to map Command-b in Insert mode: >
+	:imap <D-b> barritone
+
+1.13 MAPPING IN modifyOtherKeys mode			*modifyOtherKeys*
 
 Xterm and a few other terminals can be put in a mode where keys with modifiers
 are sent with a special escape code.  Vim recognizes these codes and can then
@@ -1048,7 +1058,7 @@ When the 'esckeys' option is off, then modifyOtherKeys will be disabled in
 Insert mode to avoid every key with a modifier causing Insert mode to end.
 
 
-1.13 MAPPING WITH KITTY KEYBOARD PROTOCOL	 *kitty-keyboard-protocol*
+1.14 MAPPING WITH KITTY KEYBOARD PROTOCOL	 *kitty-keyboard-protocol*
 
 If the value of 'term' contains "kitty" then Vim will send out an escape
 sequence to enable the Kitty keyboard protocol.  This can be changed with the
@@ -1075,7 +1085,7 @@ translated).  The meaning of {value}:
 			previous state is unknown
 
 
-1.14 MAPPING AN OPERATOR				*:map-operator*
+1.15 MAPPING AN OPERATOR				*:map-operator*
 
 An operator is used before a {motion} command.  To define your own operator
 you must create a mapping that first sets the 'operatorfunc' option and then