runtime(kitty): Fix regex for kittyMapSeq region

Commit: 
https://github.com/vim/vim/commit/8eceebae710bdbfc8d2648cae8dbe01302dd468b
Author: bbnolauv <[email protected]>
Date:   Wed Jun 3 17:52:37 2026 +0000

    runtime(kitty): Fix regex for kittyMapSeq region
    
    closes: https://github.com/vim/vim/issues/20422
    
    Signed-off-by: bbnolauv <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/syntax/kitty.vim b/runtime/syntax/kitty.vim
index 6d37b664d..825ef64d1 100644
--- a/runtime/syntax/kitty.vim
+++ b/runtime/syntax/kitty.vim
@@ -2,6 +2,7 @@
 " Language:          Kitty configuration files
 " Maintainer:        MD. Mouinul Hossain Shawon <mdmouinulhossainshawon [at] 
gmail.com>
 " Last Change:       Tue Sep 16 19:10:59 +06 2025
+" 2026 Jun 02 by Vim project: update kittyMapSeq highlight to match 
end-of-line #20422
 
 if exists("b:current_syntax")
   finish
@@ -46,7 +47,7 @@ syn keyword kittyMapName nextgroup=kittyMapValue skipwhite 
contained map
 syn region kittyMapValue start="\S" skip="[
][      ]*\" end="\ze[
]" contains=kittyMapSeq,kittyMapAction contained
 
 syn region kittyMapAction start="\S" skip="[
][      ]*\" end="\ze[
]" contains=@kittyPrimitive contained
-syn region kittyMapSeq start="\S" end="\ze\s\|^\ze[    ]*\" 
nextgroup=kittyMapAction,kittyMouseMapType skipwhite 
contains=kittyCtrl,kittyAlt,kittyShift,kittySuper,kittyAnd,kittyWith,kittyKey 
contained
+syn region kittyMapSeq start="\S" end="\ze\s\|^\ze[    ]*\\|\ze$" 
nextgroup=kittyMapAction,kittyMouseMapType skipwhite 
contains=kittyCtrl,kittyAlt,kittyShift,kittySuper,kittyAnd,kittyWith,kittyKey 
contained
 
 " Mouse shortcut """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
 " Format: `mouse_map <keys> <type> <grabbed> <action>?`

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