src/vs/workbench/contrib/markers/browser/markersModel.ts/ResourceMarkers/_compareMarkers
class ResourceMarkers:	private static _compareMarkers(a: Marker, b: Marker): number {
		return MarkerSeverity.compare(a.marker.severity, b.marker.severity)
			|| extUri.compare(a.resource, b.resource)
			|| Range.compareRangesUsingStarts(a.marker, b.marker);
	}