GNOME Shell (X11) task switcher and LibreOffice

[grey tomorrow]

Upgraded to 18.04.2 LTS (GNOME Shell 3.28.4/X11) from 16.04 LTS (Unity) and noticed that Alt-Tab task switcher doesn't update immediately with LibreOffice documents.

Case in point:
I've got LibreOffice, Firefox and a Nautilus window with a directory of LibreOffice spreadsheets open. When I Alt-Tab through this I see a generic LibreOffice icon, a Firefox icon (and its open windows) and a Nautilus icon. I'll then switch to the Nautilus window and open spreadsheet(s) and I see that LibreOffice has loaded them in the background behind the Nautilus window. Now when I Alt-Tab to switch to LibreOffice, there is not even a generic LibreOffice icon anymore. If I wait a few seconds and Alt-Tab again, I then see a LibreOffice Calc icon (and the open file windows).

Update: I restarted using Wayland instead of X11 and the problem seems resolved, although LibreOffice defaults to a generic LO icon instead of a specific Writer/Calc/Draw/etc. icon in the switcher. But Wayland is not yet an option for me at present. Nevertheless it exists in GNOME Shell using X11.

I haven't noticed similar behaviour with other programs with similar lags in the task switcher. This delay wasn't present (for me) before the upgrade/switch to GNOME Shell, so I'm assuming it's a Ubuntu/GNOME problem. I've also seen that similar problems have been reported in the past but for the most part they are quite old and I did not find this reported with the latest GNOME/Ubuntu 18.04LTS hence my new bug report. Thank you.
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ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 18.04
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-05-08 (1173 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
Package: gnome-shell 3.28.4-0ubuntu18.04.1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 4.15.0-55.60-generic 4.15.18
Tags: bionic
Uname: Linux 4.15.0-55-generic x86_64
UpgradeStatus: Upgraded to bionic on 2019-06-15 (40 days ago)
UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo video
_MarkForUpload: True

[Daniel van Vugt (vanvugt)]

Please try live booting Ubuntu 19.04 from USB (http://releases.ubuntu.com/19.04/) and tell us if it has the same problem.

If the same problem exists in 19.04 then please report it to the Gnome Shell developers as a new issue at:

  http://gitlab.gnome.org/GNOME/gnome-shell/issues

and then tell us the new issue ID.

[grey tomorrow (gtomorrow)]

Will do.

[Daniel van Vugt (vanvugt)]

Also, please run this command to automatically gather information about the affected machine:

  apport-collect 1837968

[grey tomorrow (gtomorrow)]

apport information

[grey tomorrow (gtomorrow)]

apport information

[grey tomorrow (gtomorrow)]

apport information

[grey tomorrow (gtomorrow)]

apport information

[grey tomorrow (gtomorrow)]

apport-collect done.
I also booted into a live session of Ubuntu 19.04 and the problem in fact does not exist...but...
1) I'm not sure what system the live session boots into by default, Wayland or X11,
2) as you can see the Alt-Tab task switcher is totally different from the 18.04 version!

[grey tomorrow (gtomorrow)]

Illustrating further the problem, with LibreOffice activated but no documents loaded...

[grey tomorrow (gtomorrow)]

...and with files loaded/loading...

[Launchpad Janitor (janitor)]

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