The frame-attached overlay is the pointer position at the last damage
frame; repeats re-encoding a static desktop froze the blended cursor
between redraws — on-glass the composite-mode cursor stuttered while
window drags (constant damage) were smooth. Refresh the repeat's overlay
from Capturer::cursor each tick so pointer-only motion re-blends at tick
rate — the bandwidth the pre-channel embedded mode already paid. Linux
only: the Windows capturer composites internally and its frames must
never carry an overlay a blend path would double-draw.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehlerandClaude Fable 5
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