Make raw pixel access work even with DDBs under MSW.

This is inefficient, because we need to copy pixels to and from them, but
better than silently doing nothing.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75438 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/bitmap.cpp

@@ -242,6 +242,8 @@ void wxBitmapRefData::Free()
         {
             wxLogLastError(wxT("DeleteObject(hbitmap)"));
         }
+
+        m_hBitmap = 0;
     }
 
     wxDELETE(m_bitmapMask);
@@ -1329,7 +1331,8 @@ void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
         wxDIB *dib = GetBitmapData()->m_dib;
         GetBitmapData()->m_dib = NULL;
 
-        // TODO: convert
+        GetBitmapData()->Free();
+        GetBitmapData()->CopyFromDIB(*dib);
 
         delete dib;
     }