2. eliminate possiblity of wxColour RGB values changing depending on colormap 3. don't allow non-const pointer access to internal GdkColor git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39748 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39538 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39495 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775