extensions/git/src/commands.ts/CommandCenter/timelineSelectForCompare
class CommandCenter:	async timelineSelectForCompare(item: TimelineItem, uri: Uri | undefined, _source: string) {
		if (!GitTimelineItem.is(item) || !uri) {
			return;
		}

		this._selectedForCompare = { uri, item };
		await commands.executeCommand('setContext', 'git.timeline.selectedForCompare', true);
	}