extensions/git/src/timelineProvider.ts/GitTimelineItem/constructor
class GitTimelineItem:	constructor(
		ref: string,
		previousRef: string,
		message: string,
		timestamp: number,
		id: string,
		contextValue: string
	) {
		const index = message.indexOf('\n');
		const label = index !== -1 ? `${message.substring(0, index)} \u2026` : message;

		super(label, timestamp);

		this.ref = ref;
		this.previousRef = previousRef;
		this.message = message;
		this.id = id;
		this.contextValue = contextValue;
	}