Report issue similar to or same as BUG 234132

[Jeremy]

After reading the bug report again more carefully, I went back and
reinstalled the originally updated ports from my poudriere repo with KF5
5.53, QT5 5.12 Plasma 5.12 xserver 1.20.3 and mesa 18.3.1, and disabled the
integrated Intel HD 4600 graphics and switched back to my discrete nvidia
card. While using the x11/nvidia-driver, KDE is working normally again with
no issues with flickering or rendering.
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