Pretty redical change concerning the underlying

  X's windows' position. Even without having
  scrolled anywhere, the device origin of the
  top left corner is no longer certain to be
  zero,zero.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@401 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775