Composite ClipNotify fix and expose event elimination

[Clemens Eisserer]

Hi,

Could it be  https://bugs.freedesktop.org/show_bug.cgi?id=22566 is
related to this?

- Clemens

2010/12/20  <ville.syrjala at nokia.com>:
> Rather than continue my attempts to hack around the issue of incorrect
> ClipNotifys during window redirection changes, I decided to tackle the
> issue in more proper manner.
>
> This series will remove the internal MapWindow+UnmapWindow cycle and
> replace it with a single ValidateTree+HandleExposures pass through
> the affected windows.
>
> As a nice bonus, this also eliminates the unnecessary expose events
> that are generated in the process. Those expose events have been a
> problem for us for quite some time. For the N900 Daniel did a hack that
> simply suppressed expose events around the MapWindow/UnmapWindow calls.
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