src/vs/editor/browser/editorDom.ts/EditorPointerEventFactory/onPointerDown
class EditorPointerEventFactory:	public onPointerDown(target: HTMLElement, callback: (e: EditorMouseEvent, pointerId: number) => void): IDisposable {
		return dom.addDisposableListener(target, dom.EventType.POINTER_DOWN, (e: PointerEvent) => {
			callback(this._create(e), e.pointerId);
		});
	}