Make the selected item visible, to match behaviour on other platforms

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77553 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/listbox_osx.cpp

@@ -191,6 +191,9 @@ void wxListBox::DoSetSelection(int n, bool select)
     m_blockEvents = false;
 
     UpdateOldSelections();
+
+    if (select)
+        EnsureVisible(n);
 }
 
 bool wxListBox::IsSelected(int n) const