src/vs/base/browser/ui/actionbar/actionViewItems.ts/ActionViewItem/updateChecked
class ActionViewItem:	protected override updateChecked(): void {
		if (this.label) {
			if (this.action.checked) {
				this.label.classList.add('checked');
			} else {
				this.label.classList.remove('checked');
			}
		}
	}