8b2bd5ebfd
The tab overflow menu's tabs list started listening for tab groups' events in order to refresh the tabs list and keep it in sync with the state of the tab strip. However, for operations that affect large tab groups all at once (restoring a closed tab group, closing a tab group), the tab group fires one event per tab all at once. This causes the tabs list to re-render itself once per tab, which is a lot of work for large tab groups. This patch prevents re-rendering more than once per frame. Differential Revision: https://phabricator.services.mozilla.com/D241380