Improved ref comment link when origin is body/title (#19741)

* Makes comments in body text/title return the base page URL instead of "" in RefCommentHTMLURL()

* Add comment explaining branch

Co-authored-by: delvh <dev.lh@web.de>

models/issue_xref.go

@@ -295,8 +295,9 @@ func CommentTypeIsRef(t CommentType) bool {
 
 // RefCommentHTMLURL returns the HTML URL for the comment that created this reference
 func (comment *Comment) RefCommentHTMLURL() string {
+	// Edge case for when the reference is inside the title or the description of the referring issue
 	if comment.RefCommentID == 0 {
-		return ""
+		return comment.RefIssueHTMLURL()
 	}
 	if err := comment.LoadRefComment(); err != nil { // Silently dropping errors :unamused:
 		log.Error("LoadRefComment(%d): %v", comment.RefCommentID, err)