Hi,
TB is not listed in calendar providers by GNOME Shell, in prefs/default apps.
I just have Evolution.
So, is that intended? Does TB really handles calendar actions?
I know that Lightning was an add-on, but that’s no more the case.
I do use TB snap, is that a snap-only bug?
Hey,
You are speaking about the ‘default applications’ screen in settings right? The calendar section is listing softwares that claim the x-scheme-handler/calendar mimetype in their .desktop, which isn’t the case of thunderbird.
Could you perhaps report the bug upstream on https://bugzilla.mozilla.org/enter_bug.cgi ?
Ok I got an answer:
The main bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=357480
The fix:
https://hg.mozilla.org/comm-central/rev/3c2ea64ee082
Six months to go for TB 91 snap. 
(I know that TB snap offers a beta channel, but I need a stable email client…)
