In PyQt5.6, connect() does strict checking of the signal signature
against the Slot decorator types, so "@slot(object)" is not a catch-all
anymore.

hydrargyrum authored Feb 12, 2016 and Romain Bignon committed Feb 13, 2016

This Model can be used in backend choice widgets. It fills the list with
available backends and icons. It can separate capabilites too.

[qcookboob] undo previous modif on backends, exceptions  are handled by app