Add a button for opening the user plugins directory
Submitted by Alex Băluț
In the preferences dialog > Plugins we display a Gtk.ListBox with two sections: the system plugins, the user plugins. It would be useful to display somehow for each section the folder where the plugins reside, and allow the user to open the folder.
The heading of a section is created in
PluginsBox._set_header. See for example how it would look if we display the path on the same line as the section name, or below, and aligned to the right of the container.
If this looks ok, we can make it a discreet button, similar to the Zoom button in the
ZoomBox widget in pitivi/utils/widgets.py which appears in the top-left corner of the timeline.