src/vs/editor/common/services/markerDecorationsService.ts/MarkerDecorations/constructor
class MarkerDecorations:	constructor(
		readonly model: ITextModel
	) {
		super();
		this._register(toDisposable(() => {
			this.model.deltaDecorations([...this._markersData.keys()], []);
			this._markersData.clear();
		}));
	}