Comment 3 for bug 1573466

as a short term workaround, the only possibility at the scripting level is to do the following:
(only possible if wmctrl still works if renamed to something else)
replace the wmctrl executable with a shell script, that does not return any errors.

This would allow, to continue testing, provided you do not use the App class features in the moment

I will try to make this internal test a bit more graceful or even optional.