patch 9.1.0424: filetype: slint files are not recognized

Problem:  filetype: slint files are not recognized
Solution: Detect '*.slint' files as slint filetype,
          include basic sling filetype plugin
          (Riley Bruins)

closes: #14808

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

.github/MAINTAINERS

@@ -216,6 +216,7 @@ runtime/ftplugin/scss.vim		@tpope
 runtime/ftplugin/sdoc.vim		@gpanders
 runtime/ftplugin/sed.vim		@dkearns
 runtime/ftplugin/sh.vim			@dkearns
+runtime/ftplugin/slint.vim		@ribru17
 runtime/ftplugin/solidity.vim		@cothi
 runtime/ftplugin/solution.vim		@dkearns
 runtime/ftplugin/spec.vim		@ignatenkobrain

runtime/filetype.vim

@@ -2060,6 +2060,9 @@ au BufNewFile,BufRead *.scala			setf scala
 " SBT - Scala Build Tool
 au BufNewFile,BufRead *.sbt			setf sbt
 
+" Slint
+au BufNewFile,BufRead *.slint			setf slint
+
 " SuperCollider
 au BufNewFile,BufRead *.sc			call dist#ft#FTsc()
 

runtime/ftplugin/slint.vim

@@ -0,0 +1,15 @@
+" Vim filetype plugin
+" Language:	slint
+" Maintainer:	Riley Bruins <ribru17@gmail.com>
+" Last Change:	2024 May 19
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+" Set 'comments' to format dashed lists in comments.
+" Also include ///, used for Doxygen.
+setl comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,:///,:// commentstring=//\ %s
+
+let b:undo_ftplugin = 'setl com< cms<'

src/testdir/test_filetype.vim

@@ -654,6 +654,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     slang: ['file.sl'],
     sage: ['file.sage'],
     slice: ['file.ice'],
+    slint: ['file.slint'],
     slpconf: ['/etc/slp.conf', 'any/etc/slp.conf'],
     slpreg: ['/etc/slp.reg', 'any/etc/slp.reg'],
     slpspi: ['/etc/slp.spi', 'any/etc/slp.spi'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    424,
 /**/
     423,
 /**/