Comment 3 for bug 47307

Yes, the wm was hung, it wasn't possible to change focus. It did seem to hand over nicely to a new wm though I don't know whether the X protocol for that needs the previous one to be alive.

It happened several times, but since then, I can't reproduce it with latest updates, even though I've carefully not got around to fixing my bug :-) It never really used to happen when I tried though anyway.

So who knows. I'll keep an eye out for it, and try to debug if I can.