src/vs/editor/common/services/markerDecorationsService.ts/MarkerDecorationsService/getMarker
class MarkerDecorationsService:	getMarker(uri: URI, decoration: IModelDecoration): IMarker | null {
		const markerDecorations = this._markerDecorations.get(uri);
		return markerDecorations ? (markerDecorations.getMarker(decoration) || null) : null;
	}