src/vs/editor/contrib/gotoSymbol/peek/referencesWidget.ts/ReferenceWidget/setSelection
class ReferenceWidget:	setSelection(selection: OneReference): Promise<any> {
		return this._revealReference(selection, true).then(() => {
			if (!this._model) {
				// disposed
				return;
			}
			// show in tree
			this._tree.setSelection([selection]);
			this._tree.setFocus([selection]);
		});
	}