message: Fix `comments-time-machine-links` on first conversation comment
diff: @@ -107,10 +107,14 @@ function addDropdownLink(menu: HTMLElement, timestamp: string): void {
  }
  function init(): void {
  - const commentPopupMenus = select.all('.js-reaction-popover-container ~ details:last-child:not(.rgh-time-machine-links)');
  + const commentPopupMenus = select.all('.timeline-comment-actions > details:last-child:not(.rgh-time-machine-links)');
  for (const menu of commentPopupMenus) {
  menu.classList.add('rgh-time-machine-links');
  - const timestamp = menu.closest('.js-comment:not(.timeline-comment-group), .js-timeline-item')!.querySelector('relative-time')!.attributes.datetime.value;
  + // The timestamp of main review comments isn't in their header but in the timeline event above #5423
  + const timestamp = menu
  + .closest('.js-comment:not([id^="pullrequestreview-"]), .js-timeline-item')!
  + .querySelector('relative-time')!
  + .attributes.datetime.value;
  addInlineLinks(menu, timestamp);
  addDropdownLink(menu, timestamp);
  }
  