src/vs/workbench/contrib/markers/browser/markersTable.ts/MarkersTable/findMarkerIndex
class MarkersTable:	private findMarkerIndex(marker: Marker): number {
		for (let index = 0; index < this.table.length; index++) {
			if (this.table.row(index).marker === marker.marker) {
				return index;
			}
		}

		return -1;
	}