vim-patch:b422a33: runtime(gdb): Update syntax and ftplugin (#37783)

- Change syntax file maintainer.
- Add Guile and Python command highlighting.
- Update command list to version 12.
- Add foldable regions for the commands 'define', 'if' and 'while'
  multiline commands.
- Support documented partial command names.
- Add matchit, browsefilter, and comment formatting support.
- Support embedded C in compiler {code|print} commands.
- Add largely complete settings highlighting and folding.
- Add syntax tests (incomplete).

Thanks to Claudio Fleiner for many years of maintenance.

closes: vim/vim#10649

b422a33ac2

Co-authored-by: Doug Kearns <dougkearns@gmail.com>

runtime/doc/syntax.txt

@@ -1397,6 +1397,14 @@ The backticks for inline java are highlighted according to the htmlError
 group to make them easier to see.
 
 
+GDB							*ft-gdb-syntax*
+
+The GDB syntax file provides syntax |folding| (see |:syn-fold|) for comments
+and block statements. This can be enabled with: >
+
+	:set foldmethod=syntax
+
+
 GROFF							*ft-groff-syntax*
 
 The groff syntax file is a wrapper for |ft-nroff-syntax|, see the notes

runtime/ftplugin/gdb.vim

@@ -1,21 +1,54 @@
 " Vim filetype plugin file
 " Language:	gdb
 " Maintainer:	Michaël Peeters <NOSPAMm.vim@noekeon.org>
-" Last Changed: 2017-10-26
-"               2024-04-10:	- add Matchit support (by Vim Project)
-"               2024-04-23:	- add space to commentstring (by Riley Bruins) ('commentstring')
+" Contributors: Riley Bruins
+" Last Changed:	2017 Oct 26
+"		2024 Apr 10: add Matchit support (by Vim Project)
+"		2024 Apr 23: add space to commentstring (by Riley Bruins) ('commentstring')
+"		2026 Feb 08: add browsefilter, comment formatting, and improve matchit support (by Vim Project)
 
-if exists("b:did_ftplugin") | finish | endif
+if exists("b:did_ftplugin")
+  finish
+endif
 let b:did_ftplugin = 1
 
+let s:cpo_save = &cpo
+set cpo&vim
+
+setlocal comments=:#
 setlocal commentstring=#\ %s
+setlocal formatoptions-=t
+setlocal formatoptions+=croql
 setlocal include=^\\s*source
 
 " Undo the stuff we changed.
-let b:undo_ftplugin = "setlocal cms< include<"
+let b:undo_ftplugin = "setlocal com< cms< fo< inc<"
 
-" Matchit support
-if !exists('b:match_words')
-  let b:match_words = '\<\%(if\|while\|define\|document\)\>:\<else\>:\<end\>'
-  let b:undo_ftplugin ..= " | unlet! b:match_words"
+if exists("loaded_matchit") && !exists("b:match_words")
+  let b:match_ignorecase = 0
+  let s:line_start = '\%(^\s*\)\@<='
+  let b:match_words =
+	\ s:line_start .. '\%(commands\|define\|document\|if\|while\|' ..
+	\     '\%(py\%[thon]\|gu\%[ile]\)\%(\s*$\)\@=\|' ..
+	\     '\%(compi\%[le]\|exp\%[ression]\)\s\+\%(c\%[ode]\|p\%[rint]\)\)\>:' ..
+	\   s:line_start .. '\%(else\|loop_continue\|loop_break\)\>:' ..
+	\ s:line_start .. 'end\>'
+  unlet s:line_start
+  let b:undo_ftplugin ..= " | unlet! b:match_ignorecase b:match_words"
 endif
+
+if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
+  let b:browsefilter =
+	\ "GDB Init Files (.gdbinit gdbinit .gdbearlyinit gdbearlyinit)\t" ..
+	\   ".gdbinit;gdbinit;.gdbearlyinit;gdbearlyinit\n" ..
+	\ "GDB Command Files (*.gdb)\t*.gdb\n"
+  if has("win32")
+    let b:browsefilter ..= "All Files (*.*)\t*\n"
+  else
+    let b:browsefilter ..= "All Files (*)\t*\n"
+  endif
+  let b:undo_ftplugin ..= " | unlet! b:browsefilter"
+endif
+
+let &cpo = s:cpo_save
+unlet s:cpo_save