To change Alt+Tab behaviour:
1. Open Settings → Devices → Keyboard → Keyboard Shortcuts
2. Scroll down to Navigation, you will find the default for "Switch
applications" is Alt+Tab
3. Change "Switch applications" to Super+Tab
4. Change "Switching windows" to Alt+Tab
I can still reproduce the bug after disabling all extensions.
** Changed in: gnome-shell (Ubuntu)
Status: Incomplete => New
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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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