src/vs/workbench/contrib/markers/browser/markers.ts/ActivityUpdater/constructor
class ActivityUpdater:	constructor(
		@IActivityService private readonly activityService: IActivityService,
		@IMarkerService private readonly markerService: IMarkerService
	) {
		super();
		this._register(this.markerService.onMarkerChanged(() => this.updateBadge()));
		this.updateBadge();
	}