src/vs/workbench/contrib/debug/browser/debugActionViewItems.ts/FocusSessionActionViewItem/update
class FocusSessionActionViewItem:	private update(session?: IDebugSession) {
		if (!session) {
			session = this.getSelectedSession();
		}
		const sessions = this.getSessions();
		const names = sessions.map(s => {
			const label = s.getLabel();
			if (s.parentSession) {
				// Indent child sessions so they look like children
				return `\u00A0\u00A0${label}`;
			}

			return label;
		});
		this.setOptions(names.map(data => <ISelectOptionItem>{ text: data }), session ? sessions.indexOf(session) : undefined);
	}