src/vs/workbench/contrib/markers/browser/markersTreeViewer.ts/MarkersTreeAccessibilityProvider/getAriaLabel
class MarkersTreeAccessibilityProvider:	public getAriaLabel(element: MarkerElement): string | null {
		if (element instanceof ResourceMarkers) {
			const path = this.labelService.getUriLabel(element.resource, { relative: true }) || element.resource.fsPath;
			return Messages.MARKERS_TREE_ARIA_LABEL_RESOURCE(element.markers.length, element.name, paths.dirname(path));
		}
		if (element instanceof Marker) {
			return Messages.MARKERS_TREE_ARIA_LABEL_MARKER(element);
		}
		if (element instanceof RelatedInformation) {
			return Messages.MARKERS_TREE_ARIA_LABEL_RELATED_INFORMATION(element.raw);
		}
		return null;
	}