set update_at on bookmarks return when changing sort order (#28807)

* set update_at on bookmarks return when changing sort order

* update bookmarks sort order test

server/channels/api4/channel_bookmark_test.go

@@ -963,8 +963,7 @@ func TestUpdateChannelBookmarkSortOrder(t *testing.T) {
 	})
 
 	t.Run("a websockets event should be fired as part of editing a bookmark's sort order", func(t *testing.T) {
-		t.Skip("MM-60499")
-
+		now := model.GetMillis()
 		webSocketClient, err := th.CreateWebSocketClient()
 		require.NoError(t, err)
 		webSocketClient.Listen()
@@ -978,6 +977,14 @@ func TestUpdateChannelBookmarkSortOrder(t *testing.T) {
 			Emoji:       ":smile:",
 		}
 
+		bookmark2 := &model.ChannelBookmark{
+			ChannelId:   th.BasicChannel.Id,
+			DisplayName: "Link bookmark test 2",
+			LinkUrl:     "https://mattermost.com",
+			Type:        model.ChannelBookmarkLink,
+			Emoji:       ":smile:",
+		}
+
 		// set the user for the session
 		originalSessionUserId := th.Context.Session().UserId
 		th.Context.Session().UserId = th.BasicUser.Id
@@ -987,6 +994,10 @@ func TestUpdateChannelBookmarkSortOrder(t *testing.T) {
 		require.Nil(t, appErr)
 		require.NotNil(t, cb)
 
+		cb, appErr = th.App.CreateChannelBookmark(th.Context, bookmark2, "")
+		require.Nil(t, appErr)
+		require.NotNil(t, cb)
+
 		bookmarks, resp, err := th.Client.UpdateChannelBookmarkSortOrder(context.Background(), th.BasicChannel.Id, cb.Id, 0)
 		require.NoError(t, err)
 		CheckOKStatus(t, resp)
@@ -1001,6 +1012,10 @@ func TestUpdateChannelBookmarkSortOrder(t *testing.T) {
 				if event.EventType() == model.WebsocketEventChannelBookmarkSorted {
 					err := json.Unmarshal([]byte(event.GetData()["bookmarks"].(string)), &bl)
 					require.NoError(t, err)
+
+					for _, b := range bl {
+						require.Greater(t, b.UpdateAt, now)
+					}
 				}
 			case <-timeout:
 				waiting = false

server/channels/store/sqlstore/channel_bookmark_store.go

@@ -270,6 +270,7 @@ func (s *SqlChannelBookmarkStore) UpdateSortOrder(bookmarkId, channelId string,
 	ids := []string{}
 	for index, b := range bookmarks {
 		b.SortOrder = int64(index)
+		b.UpdateAt = now
 		caseStmt = caseStmt.When(sq.Eq{"Id": b.Id}, strconv.FormatInt(int64(index), 10))
 		ids = append(ids, b.Id)
 	}