vim-patch:ce1d196: runtime(vim): Update base syntax, improve :match highlighting (#34912)

- Match the range prefix separately as a count.
- Match an explicit count of 1, rarely used but seen in the wild.
- Allow whitespace between the count and command.

closes: vim/vim#17717

ce1d1969f3

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

runtime/syntax/vim.vim

@@ -225,7 +225,7 @@ syn cluster vim9CmdList	contains=vim9Abstract,vim9Class,vim9Const,vim9Enum,vim9E
 syn match vimCmdSep	"\\\@1<!|"	skipwhite nextgroup=@vimCmdList,vimSubst1,@vimFunc
 syn match vimCmdSep	":\+"	skipwhite nextgroup=@vimCmdList,vimSubst1
 syn match vimCount	contained	"\d\+"
-syn match vimIsCommand	"\<\%(\h\w*\|[23]mat\%[ch]\)\>"	 nextgroup=vimBang contains=vimCommand
+syn match vimIsCommand	"\<\h\w*\>"	nextgroup=vimBang contains=vimCommand
 syn match vimBang	      contained	"!"
 syn match vimWhitespace contained	"\s\+"
 
@@ -1437,12 +1437,18 @@ endif
 
 " Match: {{{2
 " =====
-syn match	vimMatch		"\<[23]\=mat\%[ch]\>" skipwhite nextgroup=vimMatchGroup,vimMatchNone
-syn match	vimMatchGroup	contained	"[[:alnum:]._-]\+"    skipwhite nextgroup=vimMatchPattern
+syn match	vimMatch		"\<\%([1-3]\s*\)\=mat\%[ch]\>"	skipwhite nextgroup=vimMatchGroup,vimMatchNone contains=vimCount
+syn match	vimMatchGroup	contained	"[[:alnum:]._-]\+"	skipwhite nextgroup=vimMatchPattern
 syn case ignore
 syn keyword	vimMatchNone	contained	none
 syn case match
-syn region	vimMatchPattern	contained	matchgroup=Delimiter start="\z([!#$%&'()*+,-./:;<=>?@[\]^_`{}~]\)" skip="\\\\\|\\\z1" end="\z1" contains=@vimSubstList oneline
+syn region	vimMatchPattern	contained
+      \ matchgroup=Delimiter
+      \ start="\z([!#$%&'()*+,-./:;<=>?@[\]^_`{}~]\)"
+      \ skip="\\\\\|\\\z1"
+      \ end="\z1"
+      \ contains=@vimSubstList
+      \ oneline
 
 " Normal: {{{2
 " ======