src/vs/editor/common/services/markerDecorationsService.ts/MarkerDecorationsService/constructor
class MarkerDecorationsService:	constructor(
		@IModelService modelService: IModelService,
		@IMarkerService private readonly _markerService: IMarkerService
	) {
		super();
		modelService.getModels().forEach(model => this._onModelAdded(model));
		this._register(modelService.onModelAdded(this._onModelAdded, this));
		this._register(modelService.onModelRemoved(this._onModelRemoved, this));
		this._register(this._markerService.onMarkerChanged(this._handleMarkerChange, this));
	}