message: Avoid duplicate event handlers in `toggle-everything-with-alt`
diff: +import mem from 'mem';
  import select from 'select-dom';
  import delegate from 'delegate-it';
  import features from '../libs/features';
  @@ -17,7 +18,7 @@ function init(): void {
  delegate(document, '.js-file .js-resolvable-thread-toggler', 'click', clickAll(resolvedCommentsSelector));
  }
  -function clickAll(selectorGetter: ((clickedItem: HTMLElement) => string)): EventHandler {
  +const clickAll = mem((selectorGetter: ((clickedItem: HTMLElement) => string)): EventHandler => {
  return event => {
  if (event.altKey && event.isTrusted) {
  const clickedItem = event.delegateTarget;
  @@ -28,7 +29,7 @@ function clickAll(selectorGetter: ((clickedItem: HTMLElement) => string)): Event
  resetScroll();
  }
  };
  -}
  +});
  function clickAllExcept(elementsToClick: string, except: HTMLElement): void {
  for (const item of select.all(elementsToClick)) {
  