Fix border padding for special cases (STR #3061), Windows only.


git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10363 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Make the retargeting of the Windows clipboard notification
more explicit. Otherwise we could end up with
Fl::remove_clipboard_notify() unregistering, just to have it
immediately re-register again.


git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10364 ea41ed52-d2ee-0310-a9c1-e6b18d33e121