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Commit 09c12699 ("[uwac] window: fix damage region dimensions (rounding
errors)") added a 1-pixel expansion to the damage rect passed to
wl_surface_damage() (i.e. x-=1, y-=1, w+=2, h+=2) to guard against
rounding errors when a display scale factor is in use.
This causes visible rectangular glitches around every updated region.
The Wayland compositor re-composites exactly the declared damage region
from the attached buffer onto the screen. Because wlf_copy_image() only
writes pixels for the exact update rectangle, the 1-pixel border in the
buffer is never updated. With double-buffering the border pixels contain
stale data from the last time that buffer was used, and the compositor
faithfully composites those stale pixels, producing the artifact.
The floor/ceil rounding applied before the expansion is already
sufficient to cover any sub-pixel precision lost when converting from
buffer coordinates to surface coordinates. Remove the extra ±1 padding.