2 files changed, 11 insertions, 1 deletions
diff --git a/src/quick/items/qquickrendercontrol.cpp b/src/quick/items/qquickrendercontrol.cpp
index 49438c92db..34f63e3f7e 100644
--- a/src/quick/items/qquickrendercontrol.cpp
+++ b/src/quick/items/qquickrendercontrol.cpp
@@ -549,6 +549,16 @@ bool QQuickRenderControlPrivate::isRenderWindowFor(QQuickWindow *quickWin, const
     return false;
 }
 
+bool QQuickRenderControlPrivate::isRenderWindow(const QWindow *w)
+{
+    Q_Q(QQuickRenderControl);
+
+    if (window && w)
+        return q->renderWindowFor(window, nullptr) == w;
+
+    return false;
+}
+
 /*!
     \return the QQuickWindow this QQuickRenderControl is associated with.
 
diff --git a/src/quick/items/qquickrendercontrol_p.h b/src/quick/items/qquickrendercontrol_p.h
index 29b83827d6..c27604b39c 100644
--- a/src/quick/items/qquickrendercontrol_p.h
+++ b/src/quick/items/qquickrendercontrol_p.h
@@ -44,7 +44,7 @@ public:
     }
 
     static bool isRenderWindowFor(QQuickWindow *quickWin, const QWindow *renderWin);
-    virtual bool isRenderWindow(const QWindow *w) { Q_UNUSED(w); return false; }
+    virtual bool isRenderWindow(const QWindow *w);
 
     static void cleanup();