Lots of Pango etc up-ports from HEAD.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@19179 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/combobox.cpp

@@ -750,13 +750,11 @@ wxSize wxComboBox::DoGetBestSize() const
     ret.x = 0;
     if ( m_widget )
     {
-        GdkFont *font = m_font.GetInternalFont();
-
-        wxCoord width;
-        size_t count = Number();
+        int width;
+        size_t count = GetCount();
         for ( size_t n = 0; n < count; n++ )
         {
-            width = (wxCoord)gdk_string_width(font, wxGTK_CONV( GetString(n) ) );
+            GetTextExtent( GetString(n), &width, NULL, NULL, NULL, &m_font );
             if ( width > ret.x )
                 ret.x = width;
         }