Replaced Blit with DrawBitmap in wxPoem to make it run with wxX11

Added some XSyncs because it seems the only way to make
dialog sizing work


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14560 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

demos/poem/wxpoem.cpp

@@ -727,9 +727,12 @@ void MyCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
         int xx, yy;
         TheMainWindow->GetClientSize(&xx, &yy);
 
+        dc.DrawBitmap(* backingBitmap, 0, 0);
+#if 0        
         wxMemoryDC memDC;
         memDC.SelectObject(* backingBitmap);
         dc.Blit(0, 0, backingBitmap->GetWidth(), backingBitmap->GetHeight(), &memDC, 0, 0);
+#endif
   }
 }