Set CAN_FOCUS to False for notebook widgets

[marktimarev]

Resolves #issue400

Apparently, we do not need to subscribe on focus-grub event and put the grab back to the VTE terminal. Adding a setting can_focus=false is enough.

Applying it I am still able to rename the tab by a double click, though just clicking on it does not steal l the focus.

[mattrose]

This looks perfect and I'm sure it works, but I'll just take a look at this and merge this tomorrow (Friday) if work is not too busy. Thanks so much! It's hard to believe a bug that's been open for 4 years has a one-line fix.

[marktimarev]

Well, well. We still need your check in the sense that the commit made in gnome-terminal at https://bug746665.bugzilla-attachments.gnome.org/attachment.cgi?id=300270 clearly states that:

Merely setting TerminalTabLabel:can-focus to FALSE is not enough to
prevent the keyboard focus from entering the tab label.

That's exactly what I did but it works for me. Maybe there was another problem in GTK at the moment that was fixed during these 4 years, and so now we can just use can_focus=False

[mattrose]

Works for me too, merging!

[mattrose]

Thanks again