1. more accurate conversion from 8-bit wx color to 16-bit GDK color

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

include/wx/gtk/clrpicker.h

@@ -57,8 +57,8 @@ protected:
 
 public:     // used by the GTK callback only
 
-    GdkColor *GetGdkColor() const
-        { return m_colour.GetColor(); }
+    void SetGdkColor(const GdkColor& gdkColor)
+        { m_colour = wxColor(gdkColor); }
 
     wxWindow *m_topParent;