dring hogs cpu when viewing Settings->Media page in jami-gnome

How to reproduce:

• Start dring and jami-gnome.
• Select Settings->Media page.
• dring cpu usage goes to 100 % according to top (i.e. one core fully used), and stays there until I leave the Media settings page. This happens also with no webcam/video device attached to the computer.

System info:

$ /usr/lib/ring/dring --version Jami Daemon 9.1.0, by Savoir-faire Linux 2004-2019 https://jami.net/ [Video support enabled]

$ jami-gnome --version 74ef874ea412985a5cfb49e3e162d20b5707733b - unknown (About page says "Free as in Freedom" built on 2020-04-14 20:24:50 UTC)

OS: Xubuntu 18.04 with kernel 5.5.17

This is NOT repeatable on Xubuntu 20.04 beta with Jami Daemon 7.4.0/jami-gnome "Live Free or Die" built on 2020-03-23 06:24:58.