src/vs/workbench/contrib/comments/browser/commentThreadWidget.ts/ReviewZoneWidget/setActionBarActions
class ReviewZoneWidget:	private setActionBarActions(menu: IMenu): void {
		const groups = menu.getActions({ shouldForwardArgs: true }).reduce((r, [, actions]) => [...r, ...actions], <(MenuItemAction | SubmenuItemAction)[]>[]);
		this._actionbarWidget.clear();
		this._actionbarWidget.push([...groups, this._collapseAction], { label: false, icon: true });
	}