Add support for dynamic auto-completion in wxTextEntry.

Add wxTextCompleter class which allows to return the possible completions
dynamically and wxTextCompleter::AutoComplete() overload using it. So far this
is only implemented for wxMSW.

Also fix calling wxTextEntry::AutoComplete(wxArrayString) multiple times under
MSW, this didn't correctly update the list of shown completions before.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67511 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/textcompleter.h

@@ -0,0 +1,31 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/textcompleter.h
+// Purpose:     Declaration of wxTextCompleter class.
+// Author:      Vadim Zeitlin
+// Created:     2011-04-13
+// RCS-ID:      $Id: wxhead.h,v 1.12 2010-04-22 12:44:51 zeitlin Exp $
+// Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_TEXTCOMPLETER_H_
+#define _WX_TEXTCOMPLETER_H_
+
+// ----------------------------------------------------------------------------
+// wxTextCompleter: used by wxTextEnter::AutoComplete()
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_CORE wxTextCompleter
+{
+public:
+    wxTextCompleter() { }
+
+    virtual void GetCompletions(const wxString& prefix, wxArrayString& res) = 0;
+
+    virtual ~wxTextCompleter();
+
+private:
+    wxDECLARE_NO_COPY_CLASS(wxTextCompleter);
+};
+
+#endif // _WX_TEXTCOMPLETER_H_