Merge remote-tracking branch 'origin/5.9' into dev

Change-Id: I84097f8e7b3b2128028bd7693c913d6968b82bfe

1 files changed, 8 insertions, 0 deletions

diff --git a/src/widgets/kernel/qwindowcontainer.cpp b/src/widgets/kernel/qwindowcontainer.cpp
index e72479fd09..a17c69c5ce 100644
--- a/src/widgets/kernel/qwindowcontainer.cpp
+++ b/src/widgets/kernel/qwindowcontainer.cpp
@@ -241,6 +241,14 @@ QWindow *QWindowContainer::containedWindow() const
 QWindowContainer::~QWindowContainer()
 {
     Q_D(QWindowContainer);
+
+    // Call destroy() explicitly first. The dtor would do this too, but
+    // QEvent::PlatformSurface delivery relies on virtuals. Getting
+    // SurfaceAboutToBeDestroyed can be essential for OpenGL, Vulkan, etc.
+    // QWindow subclasses in particular. Keep these working.
+    if (d->window)
+        d->window->destroy();
+
     delete d->window;
 }