add a more readable wrapper for CreateDocument(wxEmptyString, wxDOC_NEW)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56018 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/docview.h

@@ -340,6 +340,14 @@ public:
     */
     virtual wxDocument* CreateDocument(const wxString& path, long flags = 0);
 
+    /**
+        Creates an empty new document.
+
+        This is equivalent to calling CreateDocument() with @c wxDOC_NEW flags
+        and without the file name.
+     */
+    wxDocument *CreateNewDocument();
+
     /**
         Creates a new view for the given document. If more than one view is
         allowed for the document (by virtue of multiple templates mentioning