vim-patch:9.1.1359: filetype: GNU Radio config files are not recognized

Problem:  filetype: GNU Radio config files are not recognized.
Solution: detect GNU Radio config files as confini filetype.  Only
          allow '#' as start of comment in confini syntax (zeertzjq).

Ref:
- https://wiki.gnuradio.org/index.php/Configuration_Files

closes: vim/vim#17242

9c9200d1ea

runtime/lua/vim/filetype.lua

@@ -2280,6 +2280,8 @@ local pattern = {
     ['asterisk/.*%.conf'] = starsetf('asterisk'),
     ['asterisk.*/.*voicemail%.conf'] = starsetf('asteriskvm'),
     ['^dictd.*%.conf$'] = 'dictdconf',
+    ['/%.?gnuradio/.*%.conf$'] = 'confini',
+    ['/gnuradio/conf%.d/.*%.conf$'] = 'confini',
     ['/lxqt/.*%.conf$'] = 'dosini',
     ['/screengrab/.*%.conf$'] = 'dosini',
     ['/%.config/fd/ignore$'] = 'gitignore',

runtime/syntax/cfg.vim

@@ -1,7 +1,7 @@
 " Vim syntax file
 " Language:	Good old CFG files
 " Maintainer:	Igor N. Prischepoff (igor@tyumbit.ru, pri_igor@mail.ru)
-" Last change:	2012 Aug 11
+" Last Change:	2012 Aug 11
 " 2024 Nov 14 by Vim project:  // only denotes a comment when starting a line (#16051)
 
 " quit when a syntax file was already loaded

runtime/syntax/confini.vim

@@ -1,5 +1,7 @@
 " Vim syntax file
 " Language: confini
+" Last Change:
+" 2025 May 02 by Vim project commented line starts with # only
 
 " Quit if a syntax file was already loaded
 if exists("b:current_syntax")
@@ -9,4 +11,8 @@ endif
 " Use the cfg syntax for now, it's similar.
 runtime! syntax/cfg.vim
 
+" Only accept '#' as the start of a comment.
+syn clear CfgComment
+syn match CfgComment "#.*" contains=@Spell
+
 let b:current_syntax = 'confini'

test/old/testdir/test_filetype.vim

@@ -183,7 +183,8 @@ func s:GetFilenameChecks() abort
     \ 'conaryrecipe': ['file.recipe'],
     \ 'conf': ['auto.master', 'file.conf', 'texdoc.cnf', '.x11vncrc', '.chktexrc', '.ripgreprc', 'ripgreprc', 'file.ctags'],
     \ 'config': ['configure.in', 'configure.ac', '/etc/hostname.file', 'any/etc/hostname.file'],
-    \ 'confini': ['pacman.conf', 'paru.conf', 'mpv.conf', 'any/.aws/config', 'any/.aws/credentials', 'file.nmconnection'],
+    \ 'confini': ['pacman.conf', 'paru.conf', 'mpv.conf', 'any/.aws/config', 'any/.aws/credentials', 'file.nmconnection',
+    \             'any/.gnuradio/grc.conf', 'any/gnuradio/config.conf', 'any/gnuradio/conf.d/modtool.conf'],
     \ 'context': ['tex/context/any/file.tex', 'file.mkii', 'file.mkiv', 'file.mkvi', 'file.mkxl', 'file.mklx'],
     \ 'cook': ['file.cook'],
     \ 'corn': ['file.corn'],