src/vs/base/parts/quickinput/browser/quickInputList.ts/QuickInputList/toggleCheckbox
class QuickInputList:	toggleCheckbox() {
		try {
			this._fireCheckedEvents = false;
			const elements = this.list.getFocusedElements();
			const allChecked = this.allVisibleChecked(elements);
			for (const element of elements) {
				element.checked = !allChecked;
			}
		} finally {
			this._fireCheckedEvents = true;
			this.fireCheckedEvents();
		}
	}