Use window() instead of obsolete topLevelWidget()

src/qt/guiutil.cpp

@@ -339,7 +339,7 @@ bool checkPoint(const QPoint &p, const QWidget *w)
 {
     QWidget *atW = QApplication::widgetAt(w->mapToGlobal(p));
     if (!atW) return false;
-    return atW->topLevelWidget() == w;
+    return atW->window() == w;
 }
 
 bool isObscured(QWidget *w)