- Only show one notification at a time
- Fix pylint errors

- Rename notify to notification
- Move get_show_in_roster() to gtk.util
- Move get_show_in_systray() to gtk.util

With this Gajim loses the ability to draw animated GIFs in the Roster

GIFs have numerous drawbacks:

- We cant add them to the IconTheme, which means we need a different interface to load them
- The IconTheme scales all icons we load for the current scale (HiDPI)
- The animation causes many updates to the Roster, and causes high cpu usage

Fixes #8814, #8655

This is needed for tests to work

- Use parse_datetime()
- Improve tzo node validation

The added account causes an issue with test_gui_interface,
so the account needs to be removed again

- Move updating tags into HtmlTextView
- Rename some vars
- Remove legacy GTK code

Remove checking for font_scale, Gtk.TextIter.get_attributes() seems buggy at
the moment, and we dont need to check the current scale to apply a new scale

Fixes #9067

data is now a str

Otherwise we have to guess the encoding of the host system

This is a regression from e281fb68

Fixes #9440

Andrey Gursky authored 6 years ago and Philipp Hörist committed 6 years ago

Fixes #9427