Bug#501125: Plain vanilla QT build resolved the issue
It seems a bit odd to me to suspect an Ubuntu customization when the bug
happens in Debian.
Duh, I obviously meant Debian :)
I reinstalled the official QT version and deleted libuiminputcontextplugin -- and the infinite loop disappeared. So I can confirm that libuiminputcontextplugin is the culprit somehow.
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