message: truncate long display names in timeline headings
  partial fix for vector-im/riot-web#5739
diff: @@ -56,13 +56,17 @@ limitations under the License.
  color: $primary-fg-color;
  font-size: 14px;
  display: inline-block; /* anti-zalgo, with overflow hidden */
  - overflow-y: hidden;
  + overflow: hidden;
  cursor: pointer;
  padding-left: 65px; /* left gutter */
  padding-bottom: 0px;
  padding-top: 0px;
  margin: 0px;
  line-height: 17px;
  + /* the next three lines, along with overflow hidden, truncate long display names */
  + white-space: nowrap;
  + text-overflow: ellipsis;
  + max-width: calc(100% - 65px);
  }
  .mx_EventTile .mx_SenderProfile .mx_Flair {
  