Can't minimize Thunderbird Lightning reminder window

[Dominik]

Ever since Ubuntu moved back to Gnome from Unity, it's impossible to minimize the Thunderbird Lightning reminder window. It's really annoying, the window is always on top of Thunderbird and has to be constantly moved around to use the program.

Closing the window makes no sense as a) it tends to start syncing the events with reminders, which can show conflict prompts requiring even more work from the user and b) the window comes back very quickly. So, minimize makes the most sense.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CurrentDesktop: GNOME
DistroRelease: Ubuntu 20.04
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-10-12 (903 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Beta amd64 (20171011)
NonfreeKernelModules: nvidia
Package: mutter 3.36.0-2ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
Tags: focal
Uname: Linux 5.4.0-18-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-03-26 (7 days ago)
UserGroups: audio cdrom dialout kvm lpadmin sudo vboxusers video
_MarkForUpload: True

[Olivier Tilloy (osomon)]

I can confirm that when using the unity session, the reminder window can be minimized, whereas in the stock (GNOME) Ubuntu session, it cannot, and it remains on top of the main thunderbird window.

[Olivier Tilloy (osomon)]

Thanks for the report Dominik. Would you mind filing an upstream bug at https://bugzilla.mozilla.org/enter_bug.cgi#h=dupes%7CCalendar, and sharing the link to it here?

[Dominik (dominalien)]

Do you really think it’s an issue with TB and not the window manager? Before I reported the bug here I looked at this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1271097 and it looks like the reminder window can or cannot be minimised depending on where it’s running (it can in Unity, apparently Windows, it can’t in Gnome and MATE). So... it’s WM dependent?

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:

apport-collect 1869470

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Dominik (dominalien)]

apport information

[Dominik (dominalien)]

apport information

[Gianluca Bertaina (bertaina)]

I am also affected by this bug, which is particularly annoying. Is there any info that I can provide to debug it?

[KJ (kjathome)]

Me too and it's really annoying cause it always has the focus and covers all the other windows.
No solution so far?

[Dominik (dominalien)]

FWIW it works fine on KDE: the reminder can be minimized and put behind the main TB window.