src/vs/workbench/browser/parts/views/viewPaneContainer.ts/ViewPaneDropOverlay/constructor
class ViewPaneDropOverlay:	constructor(
		private paneElement: HTMLElement,
		private orientation: Orientation | undefined,
		private bounds: BoundingRect | undefined,
		protected location: ViewContainerLocation,
		themeService: IThemeService,
	) {
		super(themeService);
		this.cleanupOverlayScheduler = this._register(new RunOnceScheduler(() => this.dispose(), 300));

		this.create();
	}