fix

Author: wxiaoguang

routers/web/repo/issue.go

@@ -1621,8 +1621,10 @@ func ViewIssue(ctx *context.Context) {
 			comment.Type == issues_model.CommentTypeStopTracking {
 			// drop error since times could be pruned from DB..
 			_ = comment.LoadTime()
-		} else if comment.Type == issues_model.CommentTypeClose {
-			// record ID of latest closed comment.
+		}
+
+		if comment.Type == issues_model.CommentTypeClose || comment.Type == issues_model.CommentTypeMergePull {
+			// record ID of the latest closed/merged comment.
 			// if PR is closed, the comments whose type is CommentTypePullRequestPush(29) after latestCloseCommentID won't be rendered.
 			latestCloseCommentID = comment.ID
 		}