Implemented DoGetBestSize for wxListBox, (native) wxComboBox and

wxTextCtrl, and used it when wxSize(-1, -1) is passed to Create, to set
the initial size.
  Added wxDoChangeFont and wxXmStringToString helper functions, removed
the use of m_stringList in native wxComboBox, removed some duplicated code
in wxWindow.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19296 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/motif/listbox.h

@@ -88,6 +88,8 @@ public:
     virtual void DoToggleItem(int item, int x) {};
 #endif
 protected:
+    virtual wxSize DoGetBestSize() const;
+
     int       m_noItems;
     
     // List mapping positions->client data