When it is present, no-window widgets sometimes don't get expose events for reasons I could not determine. And it is dubious that it improved scrolling performance on modern hardware anyway, and almost certainly doesn't help now that GTK+ is using "client side windows". git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64431 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775