message: Use Set::size instead of Array.from()::length
diff: @@ -189,10 +189,6 @@ export default class UserMenu extends React.Component<IProps, IState> {
  }
  }
  - get pendingActionsCount(): number {
  - return Array.from(this.state.pendingRoomJoin).length;
  - }
  -
  private onOpenMenuClick = (ev: React.MouseEvent) => {
  ev.preventDefault();
  ev.stopPropagation();
  @@ -654,11 +650,11 @@ export default class UserMenu extends React.Component<IProps, IState> {
  />
  </span>
  {name}
  - {this.pendingActionsCount > 0 && (
  + {this.state.pendingRoomJoin.size > 0 && (
  <InlineSpinner>
  <TooltipButton helpText={_t(
  "Currently joining %(count)s rooms",
  - { count: this.pendingActionsCount },
  + { count: this.state.pendingRoomJoin.size },
  )} />
  </InlineSpinner>
  )}
  