[PATCH 6/6] exa: fix a serious issue in exaChangeWindowAttributes (and some more related things)

[Maarten Maathuis]

>
> It would be really nice if you would put information like this in your
> commit messages so that people looking at the history can determine
> the reason for the commit.

After Michel's question i updated the commit message to contain more
information. A few updated patches will be posted shortly.

Maarten.