message: Fix sticky headers being left on display:none if they change too quickly
diff: @@ -146,6 +146,7 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
  const slRect = sublist.getBoundingClientRect();
  const header = sublist.querySelector<HTMLDivElement>(".mx_RoomSublist2_stickable");
  + header.style.removeProperty("display"); // always clear display:none first
  if (slRect.top + headerHeight > bottom && !gotBottom) {
  header.classList.add("mx_RoomSublist2_headerContainer_sticky");
  @@ -161,8 +162,6 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
  if (lastTopHeader) {
  lastTopHeader.style.display = "none";
  }
  - // first unset it, if set in last iteration
  - header.style.removeProperty("display");
  lastTopHeader = header;
  } else {
  header.classList.remove("mx_RoomSublist2_headerContainer_sticky");
  