src/vs/workbench/contrib/timeline/browser/timelinePane.ts/TimelinePane/updateFilename
class TimelinePane:	updateFilename(filename: string | undefined) {
		this._filename = filename;
		if (this.followActiveEditor || !filename) {
			this.updateTitleDescription(filename);
		} else {
			this.updateTitleDescription(`${filename} (pinned)`);
		}
	}