Tootip and signal of Gio.MenuItem

Question

Below are two questions on the same component:

1. Which signal is triggered when the mouse passes over a Gio.MenuItem?
2. How to implement a tooltip for Gio.MenuItem?

Answer 1

The solution to get this was much further than I thought. I always suspected that the Devhelp's menu could not be built using GtkPopoverMenu because my OS uses gtk 3.14. The solution involves a totally new concept of running an application, proposed by Gtk.Application interface and the Gtk.Action features. These "new" concepts can be studied in the following places.

http://python-gtk-3-tutorial.readthedocs.io/en/latest/application.html?highlight=Gtk.Application

https://wiki.gnome.org/HowDoI/GtkApplication

https://github.com/Programmica/python-gtk3-tutorial/blob/master/_examples/application.py

Apparently tooltip features are not available for this menu type.