src/vs/workbench/contrib/markers/browser/markersModel.ts/ResourceMarkers/set
class ResourceMarkers:	set(uri: URI, marker: Marker[]) {
		this.delete(uri);
		if (isNonEmptyArray(marker)) {
			this._markersMap.set(uri, marker);
			this._total += marker.length;
			this._cachedMarkers = undefined;
		}
	}