extensions/references-view/src/navigation.ts/Navigation/next
class Navigation:	next(preserveFocus: boolean): void {
		if (!this._delegate) {
			return;
		}
		const item = this._anchor();
		if (!item) {
			return;
		}
		const newItem = this._delegate.next(item);
		const newLocation = this._delegate.location(newItem);
		if (newLocation) {
			this._view.reveal(newItem, { select: true, focus: true });
			this._open(newLocation, preserveFocus);
		}
	}