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

include/wx/generic/dirdlgg.h

@@ -25,11 +25,9 @@ extern WXDLLEXPORT_DATA(const wxChar) wxDirSelectorPromptStr[];
 
 #ifndef wxDD_DEFAULT_STYLE
 #ifdef __WXWINCE__
-    #define wxDD_DEFAULT_STYLE \
-        (wxDEFAULT_DIALOG_STYLE | wxDD_NEW_DIR_BUTTON)
+    #define wxDD_DEFAULT_STYLE      wxDEFAULT_DIALOG_STYLE
 #else
-    #define wxDD_DEFAULT_STYLE \
-        (wxDEFAULT_DIALOG_STYLE | wxRESIZE_BORDER | wxDD_NEW_DIR_BUTTON)
+    #define wxDD_DEFAULT_STYLE      (wxDEFAULT_DIALOG_STYLE|wxRESIZE_BORDER)
 #endif
 #endif