Hi,

AFAIK users of Unix systems can get Qt to use plugins they installed themselves 
in a custom/personal location. Is there a way to check programmatically where a 
given, loaded plugin lives?

In particular, is there a straightforward way to filter out styles from the 
output of `QStyleFactory::keys()` that are not in a standard system location? I 
tried to unset QT_PLUGIN_PATH before calling that function (looking at the code 
it seems that it constructs the list anew on each invocation) but apparently I 
can't do that early enough. Apparently Qt caches the list of known plugins, is 
there a way to force it to reconstruct that list?

Thanks,
R.
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