Commit: runtime(filetype): Fix Prolog file detection regex

[Christian Brabandt]

runtime(filetype): Fix Prolog file detection regex

Commit: https://github.com/vim/vim/commit/7347642633eb2de23a78c51a4388c9080440eec4
Author: igna_martinoli <ignama...@protonmail.com>
Date: Fri Jul 12 07:32:21 2024 +0200

runtime(filetype): Fix Prolog file detection regex

Problem: filetype: .pro file detection for Prolog is broken
Solution: fixed the regex to only match on the tested
cases (igna_martinoli)

fixes: #10835
closes: #15206

Signed-off-by: igna_martinoli <ignama...@protonmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/autoload/dist/ft.vim b/runtime/autoload/dist/ft.vim
index 6aea180c5..fc844383e 100644
--- a/runtime/autoload/dist/ft.vim
+++ b/runtime/autoload/dist/ft.vim
@@ -465,7 +465,7 @@ export def ProtoCheck(default: string)
# recognize Prolog by specific text in the first non-empty line
# require a blank after the '%' because Perl uses "%list" and "%translate"
var lnum = getline(nextnonblank(1))
- if lnum =~ '\<prolog\>' || lnum =~ '(^\s*(:-\|%\|\/\*))\|.\s*$'
+ if lnum =~ '\<prolog\>' || lnum =~ '^\(:-\|%\|\/\*\)\|\.$'
setf prolog
else
exe 'setf ' .. default