src/vs/workbench/contrib/bulkEdit/browser/preview/bulkEditPane.ts/BulkEditPane/toggleChecked
class BulkEditPane:	toggleChecked() {
		const [first] = this._tree.getFocus();
		if ((first instanceof FileElement || first instanceof TextEditElement) && !first.isDisabled()) {
			first.setChecked(!first.isChecked());
		}
	}