runtime(indent): allow matching negative numbers for gnu indent config file

Commit: 
https://github.com/vim/vim/commit/ee20fc8062b43eb8e52014978ed8f200158a7efd
Author: John M Devin <john.m.de...@gmail.com>
Date:   Sun Sep 29 11:18:42 2024 +0200

    runtime(indent): allow matching negative numbers for gnu indent config file
    
    Some gnu indent options take negative numbers (e.g. --indent-label).
    Add matching for an optional single '-' before the number.
    
    closes: #15754
    
    Signed-off-by: John M Devin <john.m.de...@gmail.com>
    Signed-off-by: Doug Kearns <dougkea...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/syntax/indent.vim b/runtime/syntax/indent.vim
index b2a1a0c85..921a0a8ad 100644
--- a/runtime/syntax/indent.vim
+++ b/runtime/syntax/indent.vim
@@ -2,7 +2,7 @@
 " Language:            indent(1) configuration file
 " Maintainer:          Doug Kearns <dougkea...@gmail.com>
 " Previous Maintainer: Nikolai Weibull <n...@bitwi.se>
-" Last Change:         2021 Nov 17
+" Last Change:         2024 Sep 29
 "   indent_is_bsd:      If exists, will change somewhat to match BSD 
implementation
 "
 " TODO:     is the deny-all (a la lilo.vim nice or no?)...
@@ -34,7 +34,7 @@ endif
 syn match   indentOptions 
'-\%(bli\|c\%([bl]i\|[dip]\)\=\|di\=\|ip\=\|lc\=\|pp\=i\|sbi\|ts\|-\%(brace-indent\|comment-indentation\|case-brace-indentation\|declaration-comment-column\|continuation-indentation\|case-indentation\|else-endif-column\|line-comments-indentation\|declaration-indentation\|indent-level\|parameter-indentation\|line-length\|comment-line-length\|paren-indentation\|preprocessor-indentation\|struct-brace-indentation\|tab-size\)\)'
                         \ nextgroup=indentNumber skipwhite skipempty
 
-syn match   indentNumber  display contained '\d\+\>'
+syn match   indentNumber  display contained '-\=\d\+\>'
 
 syn match   indentOptions '-T'
                         \ nextgroup=indentIdent skipwhite skipempty

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