message: Fix backspace without slate focus killing everything
diff: @@ -401,6 +401,12 @@ const LoggedInView = createReactClass({
  const isClickShortcut = ev.target !== document.body &&
  (ev.key === "Space" || ev.key === "Enter");
  + // XXX: Remove after CIDER replaces Slate completely: https://github.com/vector-im/riot-web/issues/11036
  + if (ev.key === "Backspace") {
  + ev.stopPropagation();
  + return;
  + }
  +
  if (!isClickShortcut && !canElementReceiveInput(ev.target)) {
  // synchronous dispatch so we focus before key generates input
  dis.dispatch({action: 'focus_composer'}, true);
  