src/vs/workbench/browser/parts/editor/editorDropTarget.ts/DropOverlay/constructor
class DropOverlay:	constructor(
		private accessor: IEditorGroupsAccessor,
		private groupView: IEditorGroupView,
		@IThemeService themeService: IThemeService,
		@IInstantiationService private instantiationService: IInstantiationService,
		@IFileDialogService private readonly fileDialogService: IFileDialogService,
		@IEditorService private readonly editorService: IEditorService,
		@IDialogService private readonly dialogService: IDialogService,
		@IEditorGroupsService private readonly editorGroupService: IEditorGroupsService
	) {
		super(themeService);

		this.cleanupOverlayScheduler = this._register(new RunOnceScheduler(() => this.dispose(), 300));

		this.create();
	}