list: do not steal focus for hidden elements (properly get style)

src/vs/base/browser/ui/list/listWidget.ts

@@ -351,8 +351,9 @@ class DOMFocusController<T> implements IDisposable {
 
 		const focusedDomElement = this.view.domElement(focus[0]);
 		const tabIndexElement = focusedDomElement.querySelector('[tabIndex]');
+		const style = tabIndexElement && window.getComputedStyle(tabIndexElement);
 
-		if (!tabIndexElement || !(tabIndexElement instanceof HTMLElement) || tabIndexElement.style.visibility === 'hidden' || tabIndexElement.style.display === 'none') {
+		if (!tabIndexElement || !(tabIndexElement instanceof HTMLElement) || style.visibility === 'hidden' || style.display === 'none') {
 			return;
 		}