[Bug 59335] the ghost borders may destroy window contents

[Jörg Höhle]

This attachment show an effect that's not systematic. It looks like
sometimes there's a ghost border that remains atop all normal visible
windows. Then when a window (e.g. the snapshot application's window) is
moved, blue colors overwrites part of it.

This effect is different from the typical case where the ghost border is
just drawn once while opening a menu.

** Attachment added: "ghost borders destroy the snapshot window's content while it's moved."
   http://librarian.launchpad.net/4166193/depth8-snapshot.png

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ghost borders appear in top-left of 8bit display with Human theme
https://launchpad.net/bugs/59335