File/dir dialog styles and other changes (patch 1488371):

- check invalid combinations of styles in wxFileDialogBase::Create()
- use wxFD_XXX naming convention for wxFileDialog styles
- replaces wxDD_NEW_DIR_BUTTON with wxDD_DIR_MUST_EXIST
- removes #ifdef __WXGTK24__ / #endif blocks from wxGTK code
- removes wxFileDialogBase::Get/SetStyle and wxFileDialogBase::m_fileName
- renames wxDirDialogGTK to wxDirDialog


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39402 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/richtext/richtext.cpp

@@ -721,7 +721,7 @@ void MyFrame::OnOpen(wxCommandEvent& WXUNUSED(event))
         path,
         filename,
         filter,
-        wxOPEN);
+        wxFD_OPEN);
 
     if (dialog.ShowModal() == wxID_OK)
     {
@@ -759,7 +759,7 @@ void MyFrame::OnSaveAs(wxCommandEvent& WXUNUSED(event))
         path,
         filename,
         filter,
-        wxSAVE);
+        wxFD_SAVE);
 
     if (dialog.ShowModal() == wxID_OK)
     {