Comment 0 for bug 1837968

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.