GitLab

Caches now also the circle clipping

Iterating over the css data causes performance issues on older machines

Fixes #9820

The latter is a maintained fork that runs natively on python2/python3
(without using the fragile 2to3), fixes deprecations, and has a passing
testsuite.

- Show reason when group chat is gone
- Follow redirect if one exists

- Show reason when group chat is gone
- Follow redirect if one exists

Gajim doesn't use GSettings, so data migration is not needed.
https://blogs.gnome.org/mclasen/2019/07/12/settings-in-a-sandbox-world/

This can be easier done by just removing the autojoin flag

The available options regarding closing tabs should be enough

Clearly separate join and creation even though this is not the case
protocol wise