modesetting + glamor: glitches and blitting(?) visible
X.Org X Server 1.20.11 modeset(0): glamor X acceleration enabled on Mesa Intel(R) UHD Graphics (CML GT2) mesa 21.2.5
No compositor running.
Disabling glamor ("AccelMethod" "none") makes the issue disappear. Using the intel driver also fixes the issue.
If you notice, the repaint is slower if I don't move the mouse or do any activity.
The menus are not the only place where this is visible, but for some reason they are the most visible. 100% reproducible on this system.