added wxFont::IsFixedWidth(), documented it and implemented for wxGTK/Motif

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13570 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk1/font.h

@@ -86,6 +86,7 @@ public:
     virtual bool GetUnderlined() const;
     virtual wxFontEncoding GetEncoding() const;
     virtual wxNativeFontInfo *GetNativeFontInfo() const;
+    virtual bool IsFixedWidth() const;
 
     virtual void SetPointSize( int pointSize );
     virtual void SetFamily( int family );
@@ -107,6 +108,9 @@ protected:
     // common part of all ctors
     void Init();
 
+    // do we have the XFLD for this font (or just wxWin description)?
+    inline bool HasNativeFont() const;
+
 private:
     DECLARE_DYNAMIC_CLASS(wxFont)
 };