save provider preferences automatically
I think that we maybe do not need a "save" button. We can do as many other interfaces and commit the changes to the config file as soon as an action is registered (ie, switch on/off), or maybe on closing the modal dialog.
one less button to click, easier UI.
thoughts?
(from redmine: created on 2013-10-10, closed on 2014-09-29, relates #4704 (closed))