https://bugs.kde.org/show_bug.cgi?id=487082

--- Comment #1 from Ritchie Frodomar <alkalinethun...@gmail.com> ---
After looking at the code for Kwin's Zoom effect (specifically
ZoomEffect::zoomIn() in zoom.cpp), I see why zooming in/out/around the screen
doesn't cause these repaint issues.

At the very end, there's a call to effects->addRepaintFull() - which ultimately
tells the compositor to repaint the entire scene.

With guidance, I could likely submit a merge request that fixes this for
partial repaints. I just don't know enough of how it works yet.

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