https://bugs.kde.org/show_bug.cgi?id=510967

--- Comment #21 from Zamundaaa <[email protected]> ---
(In reply to Błażej Szczygieł from comment #20)
> Ok, but where we can see the background if Firefox covers entire screen
> (both "scanoutCandidates" has the same size)?
The background is a subsurface. You can't actually see it, but Firefox is
misreporting the opaque region of the video, so KWin doesn't know it can ignore
the subsurface (or at least that was the issue when I last had it).

> For me HW overlay is working for Firefox (Compositing text is covered), but
> making it fullscreen the Compositing text is visible because of this, hmm.
Using multiple planes for fullscreen won't always work right now.
https://invent.kde.org/plasma/kwin/-/merge_requests/8076 will fix that.

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