This is the one that plagued a lot of you who are using WebKit styles,
although it turned out not be anything to do with WebKit styles—as
far as I can tell, this affected *all* displays. I was able to
reproduce it fairly reliably with 40 notifications at once; now, I
cannot reproduce it anymore.
The problem was that the position controller was asking itself for a
list of already-reserved rectangles, but when it answered, it claimed
that the answer was one rectangle longer than it was. As a result, it
would compare prospective rectangles against one more reserved
rectangle than it had actually received, and that last rectangle was
garbage.
Note that this was *not* a buffer overflow. The buffer into which it
copies the rectangles is always big enough to hold the entire list;
the problem was that it wasn't filling out the entire buffer (it'd
skip one rectangle), but then it would claim that it had used the
entire buffer (by not subtracting 1 from the number of returned
rectangles).
So that's another thing for you to look forward to in 1.2.1. ☺
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