haiku3d: fix crash on exit

Change-Id: I0d3d5d333f1dad5818149cde0fed29797f12e825
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2062
Reviewed-by: Axel Dörfler <[email protected]>

src/apps/haiku3d/RenderView.cpp

@@ -38,8 +38,6 @@ RenderView::RenderView(BRect frame)
 
 RenderView::~RenderView()
 {
-	_StopRenderThread();
-	_DeleteScene();
 }
 
 
@@ -55,6 +53,16 @@ RenderView::AttachedToWindow()
 }
 
 
+void
+RenderView::DetachedFromWindow()
+{
+	_StopRenderThread();
+	_DeleteScene();
+
+	BGLView::DetachedFromWindow();
+}
+
+
 uint32
 RenderView::_CreateRenderThread()
 {

src/apps/haiku3d/RenderView.h

@@ -23,6 +23,7 @@ public:
 					~RenderView();
 
 	virtual void	AttachedToWindow();
+	virtual void	DetachedFromWindow();
 	virtual void	FrameResized(float width, float height);
 	virtual	void	ErrorCallback(unsigned long error);