src/vs/editor/common/services/markerDecorationsService.ts/MarkerDecorations/update
class MarkerDecorations:	public update(markers: IMarker[], newDecorations: IModelDeltaDecoration[]): boolean {
		const oldIds = [...this._markersData.keys()];
		this._markersData.clear();
		const ids = this.model.deltaDecorations(oldIds, newDecorations);
		for (let index = 0; index < ids.length; index++) {
			this._markersData.set(ids[index], markers[index]);
		}
		return oldIds.length !== 0 || ids.length !== 0;
	}