I see the same behavior in fvwm (2.5.12-5). I get a minuscule window when I launch docker, and it never seems to do anything. I'm mostly trying to dock psi, but I've tried a few other things (gaim, and I don't remember what else). I've never had it do anything.
If I expand the tiny window manually, it's just all black, and doesn't respond to any clicks. -- http://www.doorstop.net/ -- "Computer Science is no more about computers than astronomy is about telescopes." -- E.W. Dijkstra
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