extensions/git/src/commands.ts/CommandCenter/timelineOpenDiff
class CommandCenter:	async timelineOpenDiff(item: TimelineItem, uri: Uri | undefined, _source: string) {
		const cmd = this.resolveTimelineOpenDiffCommand(
			item, uri,
			{
				preserveFocus: true,
				preview: true,
				viewColumn: ViewColumn.Active
			},
		);
		if (cmd === undefined) {
			return undefined;
		}

		return commands.executeCommand(cmd.command, ...(cmd.arguments ?? []));
	}