https://bugs.kde.org/show_bug.cgi?id=486432

--- Comment #4 from Alex Fiestas <afies...@kde.org> ---
I did some extra testing

This is reproducible with Plasma 6.0.4, stable from distro packages
It is reproducible with just one screen (built-in eDP)

Testcase: Open konsole, place it close to 0,0 and just write a letter. The
expected
damage should be somewhere close to 0x0 and narrow.

Without knowing what I'm doing I've added a few qDebugs in 
Compositor::prePaintPass

This might be perfectly normal behavior, just writing it down in case it is of
any help
- The incoming QRegion is always null
- It always obtains the correct  QRegion from layer->delegate()->prePaint();

I added another qDebug in paintPass, damages were ok as well.
I added another in SceneDelegate::paint, here the QRegion finally changes
>From QRegion(4,44 1066x21)
To QRegion(1809,44 1066x21)
which looks about right as well.

I haven't dug deeper, perhaps this is just the paint effect being silly or me
not understanding the paint effect correctly.

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