Alt-F2 dialog breaks IM focus
Reported along !432 (merged)
I've now tested with gtk3-demo, gtk3-widget-factory, nautilus and builder. It works as you describe, but if I then start gedit, the keyboard stops coming up for any of those programs until I turn it off and on again.
The real culprit seems to be the alt-f2 run dialog. As long as I use the physical keyboard, everything is fine. But clicking the entry doesn't bring up the OSK, and breaks it in the way described.