Same problems (cannot minimize and crazy flickering on more opened windows), Opera 82.0.4227.23 on Kubuntu.
Best posts made by hekrhy
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RE: [Solved]Opera Failing to MinimizeOpera for Linux
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RE: [Solved]Opera Failing to MinimizeOpera for Linux
I can confirm that the bug is fixed in 83.0.4254.62. On my Kubuntu it's finally working as expected.
- Opera for Linux