
Setting `useBodyMarkup` to `true` fails with:
JS ERROR: TypeError: this.setBody is not a function
set useBodyMarkup@resource:///org/gnome/shell/ui/messageList.js:585:14
Fixes: f0e863f529
"messageList: Use GObject properties for Message"
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3232>