src/vs/workbench/api/common/extHostQuickOpen.ts/ExtHostQuickPick/constructor
class ExtHostQuickPick:		constructor(extensionId: ExtensionIdentifier, enableProposedApi: boolean, onDispose: () => void) {
			super(extensionId, onDispose);
			this._disposables.push(
				this._onDidChangeActiveEmitter,
				this._onDidChangeSelectionEmitter,
			);
			this.update({ type: 'quickPick' });
		}