Improve wxTE_PROCESS_ENTER handling in wxUniv

include/wx/univ/textctrl.h

@@ -36,6 +36,7 @@ class WXDLLIMPEXP_FWD_CORE wxTextCtrlCommandProcessor;
 #define wxACTION_TEXT_WORD_RIGHT    wxT("wordright")
 #define wxACTION_TEXT_PAGE_UP       wxT("pageup")
 #define wxACTION_TEXT_PAGE_DOWN     wxT("pagedown")
+#define wxACTION_TEXT_RETURN        wxT("return")
 
 // clipboard operations
 #define wxACTION_TEXT_COPY          wxT("copy")
@@ -451,6 +452,8 @@ protected:
     bool DoCut();
     bool DoPaste();
 
+    bool ClickDefaultButtonIfPossible();
+
 private:
     // all these methods are for multiline text controls only