Added wxFilePickerCtrl::SetInitialDirectory().

This method allows to configure the initial directory to be shown when
browsing for files in an initially empty wxFileDirPickerCtrl.

It is also available for wxDirPickerCtrl but is less useful there.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70043 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/filepicker.h

@@ -101,6 +101,7 @@ public:     // overrides
     void OnDialogOK(wxCommandEvent &);
 
     virtual void SetPath(const wxString &str);
+    virtual void SetInitialDirectory(const wxString& dir);
 
     // see macro defined above
     FILEDIRBTN_OVERRIDES
@@ -171,6 +172,7 @@ public:     // overrides
     }
 
     virtual void SetPath(const wxString &str);
+    virtual void SetInitialDirectory(const wxString& dir);
 
     // see macro defined above
     FILEDIRBTN_OVERRIDES