Add size limit for content of comment on action ui (#12881)

Signed-off-by: a1012112796 <1012112796@qq.com>
Co-authored-by: mrsdizzie <info@mrsdizzie.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

modules/notification/action/action.go

@@ -92,13 +92,22 @@ func (a *actionNotifier) NotifyCreateIssueComment(doer *models.User, repo *model
 	act := &models.Action{
 		ActUserID: doer.ID,
 		ActUser:   doer,
-		Content:   fmt.Sprintf("%d|%s", issue.Index, comment.Content),
 		RepoID:    issue.Repo.ID,
 		Repo:      issue.Repo,
 		Comment:   comment,
 		CommentID: comment.ID,
 		IsPrivate: issue.Repo.IsPrivate,
 	}
+
+	content := ""
+
+	if len(comment.Content) > 200 {
+		content = content[:strings.LastIndex(comment.Content[0:200], " ")] + "…"
+	} else {
+		content = comment.Content
+	}
+	act.Content = fmt.Sprintf("%d|%s", issue.Index, content)
+
 	if issue.IsPull {
 		act.OpType = models.ActionCommentPull
 	} else {