Notifications aren't working on Ubuntu 20.04 with only 1 account

Description

Notifications aren’t working on Ubuntu 20.04 (fresh install).
I made sure that the notifications are enabled in the app settings.
Zenity is also installed.

Screenshots

Setup

  • OS and Version: Ubuntu Linux 20.04
  • Mailspring Version: 1.7.8-13635bcf

Additional Context

I just added another account, and the notifications suddenly started working, even though I didn’t change any of the Mailspring settings. Weird.

Probably related #1632


(Originally posted by HarunOr on GitHub.)