Reversed the meaning of black and white in wxRegion::ConvertToBitmap

so it matches the menaning of black and white in wxMask


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@20464 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/rgncmn.cpp

@@ -37,10 +37,10 @@ wxBitmap wxRegion::ConvertToBitmap() const
     wxBitmap bmp(box.GetRight(), box.GetBottom());
     wxMemoryDC dc;
     dc.SelectObject(bmp);
-    dc.SetBackground(*wxWHITE_BRUSH);
+    dc.SetBackground(*wxBLACK_BRUSH);
     dc.Clear();
     dc.SetClippingRegion(*this);
-    dc.SetBackground(*wxBLACK_BRUSH);
+    dc.SetBackground(*wxWHITE_BRUSH);
     dc.Clear();
     dc.SelectObject(wxNullBitmap);
     return bmp;