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

interface/wx/textentry.h

@@ -60,6 +60,40 @@ public:
     */
     bool AutoComplete(const wxArrayString& choices);
 
+    /**
+        Enable auto-completion using the provided completer object.
+
+        This method should be used instead of AutoComplete() overload taking
+        the array of possible completions if the total number of strings is too
+        big as it allows to return the completions dynamically, depending on
+        the text already entered by user and so is more efficient.
+
+        The specified @a completer object will be used to retrieve the list of
+        possible completions for the already entered text and will be deleted
+        by wxTextEntry itself when it's not needed any longer.
+
+        Notice that you need to include @c wx/textcompleter.h in order to
+        define your class inheriting from wxTextCompleter.
+
+        Currently this method is only implemented in wxMSW port.
+
+        @since 2.9.2
+
+        @param completer
+            The object to be used for generating completions if non-@NULL. If
+            it is @NULL, auto-completion is disabled. The wxTextEntry object
+            takes ownership of this pointer and will delete it in any case
+            (i.e. even if this method returns @false).
+
+        @return
+            @true if the auto-completion was enabled or @false if the operation
+            failed, typically because auto-completion is not supported by the
+            current platform.
+
+        @see wxTextCompleter
+     */
+    bool AutoComplete(wxTextCompleter *completer);
+
     /**
         Call this function to enable auto-completion of the text typed in a
         single-line text control using all valid file system paths.