Add a possibility to beep on no match to wxGenericTreeCtrl.

For consistency with Windows, allow to optionally generate a beep when
incremental search in the tree control doesn't find anything.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72638 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/treectrl.h

@@ -339,6 +339,18 @@ public:
     virtual wxTextCtrl *EditLabel(const wxTreeItemId& item,
                                   wxClassInfo* textCtrlClass = wxCLASSINFO(wxTextCtrl));
 
+    /**
+        Enable or disable a beep if there is no match for the currently
+        entered text when searching for the item from keyboard.
+
+        The default is to not beep in this case except in wxMSW where the
+        beep is always generated by the native control and cannot be disabled,
+        i.e. calls to this function do nothing there.
+
+        @since 2.9.5
+    */
+    void EnableBellOnNoMatch(bool on = true);
+
     /**
         Ends label editing. If @a cancelEdit is @true, the edit will be
         cancelled.