[appindicator_integration] New message icon not shown

Versions

OS: GNU/Linux Debian Sid
Gajim version: 1.3.0
Plugin version: 1.3.3
GTK version: 3.24.24
Glib version: 2.66.2
PyGObject version: 3.38.0
Python-nbxmpp version: 2.0.2
Sway version: 1.5.1
Waybar version: 0.9.5

Steps to reproduce the problem

Start Gajim with appindicator_integration plugin active.
Receive a message while Gajim is in the background.
Read the message.

Expected behavior

When the message is received, the tray icon should change from "online" to "new-message" and back to "online" once the message is read.

Actual behavior

The icon remains at "online" without changing. The self.indicator.set_status(appindicator.IndicatorStatus.ATTENTION) seems to not trigger an icon change.

Solution

In plugin.py, changing

        self.indicator.set_status(appindicator.IndicatorStatus.ATTENTION)

        self.indicator.set_status(appindicator.IndicatorStatus.ATTENTION)
        self.indicator.set_icon_full('mail-unread', 'New Message')

and adding

                    if self.connected == 1:
                        self.indicator.set_icon_full(self.online_icon, _('Online'))
                    else:
                        self.indicator.set_icon_full(self.offline_icon, _('Offline'))

to the end of the file fixes the problem for me. These should be harmless changes making the plugin more robust.