fix: limit syntax highlighting to note header

Author: jakubbortlik

after/syntax/gitlab.vim

@@ -10,13 +10,18 @@ let time_ago = '\d\+ \w\+ ago'
 let formatted_date = '\w\+ \{1,2}\d\{1,2}, \d\{4}'
 let date = '\%(' . time_ago . '\|' . formatted_date . '\|just now\)'
 
-execute 'syntax match GitlabDate "' . date . '"'
-execute 'syntax match GitlabUnresolved "\s' . g:gitlab_discussion_tree_unresolved . '\s\?"'
-execute 'syntax match GitlabUnlinked "\s' . g:gitlab_discussion_tree_unlinked . '\s\?"'
-execute 'syntax match GitlabResolved "\s' . g:gitlab_discussion_tree_resolved . '\s\?"'
-execute 'syntax match GitlabExpander "' . expanders . '"'
-execute 'syntax match GitlabDraft "' . g:gitlab_discussion_tree_draft . '"'
-execute 'syntax match GitlabUsername "' . username . '"'
+let published = date . ' \%(' . g:gitlab_discussion_tree_resolved . '\|' . g:gitlab_discussion_tree_unresolved . '\|' . g:gitlab_discussion_tree_unlinked . '\)\?'
+let state = ' \%(' . published . '\|' . g:gitlab_discussion_tree_draft . '\)'
+
+execute 'syntax match GitlabNoteHeader "' . expanders . username . state . '" contains=GitlabDate,GitlabUnresolved,GitlabUnlinked,GitlabResolved,GitlabExpander,GitlabDraft,GitlabUsername'
+
+execute 'syntax match GitlabDate "' . date . '" contained'
+execute 'syntax match GitlabUnresolved "\s' . g:gitlab_discussion_tree_unresolved . '\s\?" contained'
+execute 'syntax match GitlabUnlinked "\s' . g:gitlab_discussion_tree_unlinked . '\s\?" contained'
+execute 'syntax match GitlabResolved "\s' . g:gitlab_discussion_tree_resolved . '\s\?" contained'
+execute 'syntax match GitlabExpander "' . expanders . '" contained'
+execute 'syntax match GitlabDraft "' . g:gitlab_discussion_tree_draft . '" contained'
+execute 'syntax match GitlabUsername "' . username . '" contained'
 execute 'syntax match GitlabMention "\%(' . expanders . '\)\@<!' . username . '"'
 
 let b:current_syntax = 'gitlab'