src/vs/workbench/contrib/timeline/browser/timelinePane.ts/TimelinePane/onProvidersChanged
class TimelinePane:	private onProvidersChanged(e: TimelineProvidersChangeEvent) {
		if (e.removed) {
			for (const source of e.removed) {
				this.timelinesBySource.delete(source);
			}

			this.refresh();
		}

		if (e.added) {
			this.loadTimeline(true, e.added);
		}
	}