[xmonad] trying again: Dynamic properties patch

[Brandon Allbery]

As an attachment this time, apparently gmail mangled the previous
attempt(s).
This patch somewhat hackily enables matching things such as browser windows
where the title isn't set properly until "long" after the window is mapped,
because of the way HTML+DOM allows it to be set dynamically by scripts or
etc.

-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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