Update nautilus-python to latest upstream version - 1.2.x

[dino99]

nautilus-python package in Ubuntu is very old - v 1.1 released 7 years ago (2011), still depending on python2.7

Please update packages to latest upstream version - 1.2.x, this supports building with Python 3 and has other improvements:

1.2.2: - Fixed bug #792427, Fix folder string comparison to prevent duplicate extension loading

1.2.1: - Fixed bug #792348, Fix syntax error when building docs using python3

1.2:
    - Added capability to compile with python 3 support using PYTHON environment variable
    - Fix #781232, Improve extension path loading semantics to follow XDG recommendations
    - Fix #791208, require Nautilus 3.0 before importing extensions to prevent warnings
    - Switch to using gtkdoc mkhtml for generating devhelp2 documentation

See https://gitlab.gnome.org/GNOME/nautilus-python/blob/master/NEWS

syslog is logging that error which seems related to:
org.gnome.Nautilus[1695]: ** (nautilus:8309): CRITICAL **: nautilus_menu_provider_get_background_items: assertion 'NAUTILUS_IS_MENU_PROVIDER (provider)' failed

related reopened report: bug #1429535

Details
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https://gitlab.gnome.org/GNOME/nautilus-python/blob/master/NEWS

https://gitlab.gnome.org/GNOME/nautilus-python/compare/NAUTILUS_PYTHON_1_1_0...NAUTILUS_PYTHON_1_2_2

nautilus-python 1.2.2-1 doesn't use python3 and neither 1.1-6 or 1.2.2-1 build the docs.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: python-nautilus 1.1-6
CurrentDesktop: GNOME
SourcePackage: nautilus-python

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sam Bull (dreamsorcerer)]

Is this likely to be done for 18.04? It looks like the upstream project supports building with Python 3 with version 1.2.

[Jeremy Bícha (jbicha)]

Please file a separate bug for the python3 switch.

[Jeremy Bícha (jbicha)]

nautilus-python 1.2.2 will be available in Ubuntu 18.10.

https://launchpad.net/ubuntu/+source/nautilus-python/1.2.2-1