src/vs/base/browser/ui/contextview/contextview.ts/ContextView/constructor
class ContextView:	constructor(container: HTMLElement, domPosition: ContextViewDOMPosition) {
		super();

		this.view = DOM.$('.context-view');
		this.useFixedPosition = false;
		this.useShadowDOM = false;

		DOM.hide(this.view);

		this.setContainer(container, domPosition);

		this._register(toDisposable(() => this.setContainer(null, ContextViewDOMPosition.ABSOLUTE)));
	}