Added comment for changing issue ref (#17672)

* Added comment for changing issue ref
- Add a comment when someone changes the ref(erence?) of a issue.

models/issue.go

@@ -753,6 +753,24 @@ func (issue *Issue) ChangeRef(doer *User, oldRef string) (err error) {
 		return fmt.Errorf("updateIssueCols: %v", err)
 	}
 
+	if err = issue.loadRepo(db.GetEngine(ctx)); err != nil {
+		return fmt.Errorf("loadRepo: %v", err)
+	}
+	oldRefFriendly := strings.TrimPrefix(oldRef, "refs/heads/")
+	newRefFriendly := strings.TrimPrefix(issue.Ref, "refs/heads/")
+
+	opts := &CreateCommentOptions{
+		Type:   CommentTypeChangeIssueRef,
+		Doer:   doer,
+		Repo:   issue.Repo,
+		Issue:  issue,
+		OldRef: oldRefFriendly,
+		NewRef: newRefFriendly,
+	}
+	if _, err = createComment(db.GetEngine(ctx), opts); err != nil {
+		return fmt.Errorf("createComment: %v", err)
+	}
+
 	return committer.Commit()
 }
 

models/issue_comment.go

@@ -101,8 +101,10 @@ const (
 	CommentTypeProject
 	// 31 Project board changed
 	CommentTypeProjectBoard
-	// Dismiss Review
+	// 32 Dismiss Review
 	CommentTypeDismissReview
+	// 33 Change issue ref
+	CommentTypeChangeIssueRef
 )
 
 // RoleDescriptor defines comment tag type