message: hide resize handles next to collaped/empty sublists
diff: @@ -23,6 +23,11 @@ limitations under the License.
  flex-direction: column;
  }
  +/* hide resize handles next to collapsed / empty sublists */
  +.mx_RoomList .mx_RoomSubList:not(.mx_RoomSubList_nonEmpty) + .mx_ResizeHandle {
  + display: none;
  +}
  +
  .mx_RoomList_expandButton {
  margin-left: 8px;
  cursor: pointer;
  