Add wxFilterClassFactory::PopExtension().

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42477 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/stream.h

@@ -346,6 +346,7 @@ public:
     virtual wxFilterOutputStream *NewStream(wxOutputStream *stream) const = 0;
 
     wxString GetProtocol() const { return wxString(*GetProtocols()); }
+    wxString PopExtension(const wxString& location) const;
 
     virtual const wxChar * const *GetProtocols(wxStreamProtocolType type
                                                = wxSTREAM_PROTOCOL) const = 0;
@@ -370,6 +371,8 @@ protected:
     wxFilterClassFactory& operator=(const wxFilterClassFactory&)
         { return *this; }
 
+    wxString::size_type FindExtension(const wxChar *location) const;
+
 private:
     static wxFilterClassFactory *sm_first;
     wxFilterClassFactory *m_next;