Thanks.
Please try these separately (and reboot after each one) in
/etc/environment:
CLUTTER_PAINT=disable-culling
or
CLUTTER_PAINT=disable-offscreen-redirect
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1822857
Title:
Alt+Tab produces visual artefacts when a modal dialog is open
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