This 1-patch bundle was just applied to http://code.haskell.org/xmonad:
20100327214243 Tomas Janousek
* reveal: don't insert non-clients into the set of mapped windows
In xmonad-core, this fixes a small bug that caused doIgnored windows to get
into `mapped' and never being removed from there.
In the context of xmonad-contrib, this fixes a tremendous memory leak that
could be triggered by using MouseResizableTile and UrgencyHook at the same
time. MRT would create dummy windows that would get added to `mapped' by the
reveal call in `windows'. As these were not removed (removal from `mapped' is
filtered by `isClient'), they'd stay there forever and due to an inefficiency
in UrgencyHook would eat up all memory sooner or later.
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