Created attachment 138800 [details]
Screenshot of the bug in action, with some sensitive info blacked out to protect the innocent
Occasionally, the window shadows of a window in KWin exhibit a strange corrupted pattern, which flickers depending on (I believe?) cursor movement and disappears when the screen is fully redrawn (e.g. after taking a screenshot in Spectacle, or toggling compositing off and back on)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
Mesa version: 18.0.0
kwin 5.12.4 running on X11
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