src/vs/workbench/api/common/extHostQuickOpen.ts/ExtHostQuickPick/_fireDidTriggerItemButton
class ExtHostQuickPick:		_fireDidTriggerItemButton(itemHandle: number, buttonHandle: number) {
			const item = this._handlesToItems.get(itemHandle)!;
			if (!item || !item.buttons || !item.buttons.length) {
				return;
			}
			const button = item.buttons[buttonHandle];
			if (button) {
				this._onDidTriggerItemButtonEmitter.fire({
					button,
					item
				});
			}
		}