Check for existing colour names when adding to wxTheColourDatabase

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14041 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/src/gdi.i

@@ -643,6 +643,25 @@ public:
 
     %addmethods {
         void Append(const wxString& name, int red, int green, int blue) {
+            // first see if the name is already there
+            wxString cName = name;
+            cName.MakeUpper();
+            wxString cName2 = cName;
+            if ( !cName2.Replace("GRAY", "GREY") )
+                cName2.clear();
+
+            wxNode *node = self->First();
+            while ( node ) {
+                const wxChar *key = node->GetKeyString();
+                if ( cName == key || cName2 == key ) {
+                    wxColour* c = (wxColour *)node->Data();
+                    c->Set(red, green, blue);
+                    return;
+                }
+                node = node->Next();
+            }
+
+            // otherwise append the new colour
             self->Append(name.c_str(), new wxColour(red, green, blue));
         }
     }