Fix handling of the main window of composite controls in wxMSW wxToolTip.

The main window itself should be added using DoAddHWND() and not
AddOtherWindow() as it is not, precisely, "other". This fixes removing and
updating it twice unnecessarily.

Closes #14184.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71097 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/tooltip.cpp

@@ -502,7 +502,7 @@ void wxToolTip::SetWindow(wxWindow *win)
     // add the window itself
     if ( m_window )
     {
-        AddOtherWindow(m_window->GetHWND());
+        DoAddHWND(m_window->GetHWND());
     }
 #if !defined(__WXUNIVERSAL__)
     // and all of its subcontrols (e.g. radio buttons in a radiobox) as well