Fix regression in wxGTK wxFilePickerCtrl due to wxFileDialog changes.

Revert the changes of r72979 and fix wxFileDialog::GetDirectory() return
value bug (see #14786) differently to avoid breaking wxFilePickerCtrl which
relies on getting wxEVT_BUTTON event when the associated dialog is dismissed.

Closes #15218.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74043 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/filedlg.h

@@ -43,7 +43,6 @@ public:
 
     virtual wxString GetPath() const;
     virtual void GetPaths(wxArrayString& paths) const;
-    virtual wxString GetDirectory() const;
     virtual wxString GetFilename() const;
     virtual void GetFilenames(wxArrayString& files) const;
     virtual int GetFilterIndex() const;
@@ -59,9 +58,6 @@ public:
 
     virtual bool SupportsExtraControl() const { return true; }
 
-    // Implementation only.
-    void GTKOnAccept();
-    void GTKOnCancel();
 
 protected:
     // override this from wxTLW since the native
@@ -72,10 +68,10 @@ protected:
 
 
 private:
+    void OnFakeOk( wxCommandEvent &event );
     void OnSize(wxSizeEvent&);
     virtual void AddChildGTK(wxWindowGTK* child);
 
-    wxString m_selectedDirectory;
     wxGtkFileChooser    m_fc;
 
     DECLARE_DYNAMIC_CLASS(wxFileDialog)