Store the selected directory in wxGTK wxDirDialog.

This should help with the selected directory not being remembered since
GTK+ 2.24.11 as apparently gtk_file_chooser_get_filename() doesn't work any
more now after hiding the dialog -- so call it before doing this and save the
result.

Also get rid of the ugly and apparently completely unnecessary OnFakeOk().

Closes #14525.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72779 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dirdlg.h

@@ -42,6 +42,11 @@ public:     // overrides from wxGenericDirDialog
     void SetPath(const wxString& path);
 
 
+    // Implementation only.
+
+    void GTKOnAccept();
+    void GTKOnCancel();
+
 protected:
     // override this from wxTLW since the native
     // form doesn't have any m_wxwindow
@@ -51,10 +56,9 @@ protected:
 
 
 private:
-    void OnFakeOk( wxCommandEvent &event );
+    wxString m_selectedDirectory;
 
     DECLARE_DYNAMIC_CLASS(wxDirDialog)
-    DECLARE_EVENT_TABLE()
 };
 
 #endif // __GTKDIRDLGH__