src/vs/editor/browser/widget/diffReview.ts/DiffReview/_getCurrentFocusedRow
class DiffReview:	private _getCurrentFocusedRow(): HTMLElement | null {
		const result = <HTMLElement>document.activeElement;
		if (result && /diff-review-row/.test(result.className)) {
			return result;
		}
		return null;
	}