QGlobalStatic and windowing specific calls in dtor

[Martin Graesslin]

Hi frameworks-dev,

I have a problem with my KWayland based plugin for KIdleTime. KIdleTime uses a 
QGlobalStatic, so it gets destroyed at exit-time. At that point the 
QGuiApplication and the qpa plugin does not exist any more, so any windowing 
system specific calls will fail.

In the case of the KWayland based plugin, KWayland performs cleanup calls 
which crash as the wayland connection got already destroyed. In principle the 
same could also happen for the other plugins - they just don't perform any 
cleanup and prefer to leak X resources.

So what's the best way to handle such a situation? How can I tear-down the 
plugin in a clean way without crashing?

Cheers
Martin
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