message: Make the upload_file dispatch synchronous to make Firefox happy about it
diff: @@ -675,7 +675,7 @@ export default class RoomView extends React.Component<IProps, IState> {
  case Key.U: // Mac returns lowercase
  case Key.U.toUpperCase():
  if (isOnlyCtrlOrCmdIgnoreShiftKeyEvent(ev) && ev.shiftKey) {
  - dis.dispatch({ action: "upload_file" });
  + dis.dispatch({ action: "upload_file" }, true);
  handled = true;
  }
  break;
  