src/vs/base/parts/quickinput/browser/quickInputList.ts/QuickInputList/setAllVisibleChecked
class QuickInputList:	setAllVisibleChecked(checked: boolean) {
		try {
			this._fireCheckedEvents = false;
			this.elements.forEach(element => {
				if (!element.hidden) {
					element.checked = checked;
				}
			});
		} finally {
			this._fireCheckedEvents = true;
			this.fireCheckedEvents();
		}
	}