update-notifier's notification is huge due to large icon

[Ken VanDine]

I got a "update-notifier is ready" notification, with a HUGE icon which made the notification huge. update-notifier is a service, so shouldn't be opening a window itself. After the notification I never actually got a window. Also the shell should scale the icon to a proper size.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Didier Roche-Tolomelli (didrocks)]

Needs to be retested with G-S 3.32 which fixes the crash https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1819126. Test case is:
1. sleep 1000 on one terminal
2. kill -SIGSEGV $(pidof sleep)
-> wait for update-notifier to try showing up apport (application crash) or update-notifier (system crash) windows. This can take up to 180s.

[Didier Roche-Tolomelli (didrocks)]

Ok, after some more testing with new GNOME Shell (3.32.0 + some commits backported), the situation has now improved when this case happens:
- there is no more icons for applications not having any appinfo, like the update-notifier one.
- applications with appinfo have an icon with a decent size (typically 48x48).

I think if we really want an application to have the icon showing up, let's add then appinfo to it, otherwise, the current behaviour is fine.