Manual retest still showed nothing. Two changes to localize and fix:
1. CurrentLine alpha 0.08 → 0.22. The original value computed to only
~10/255 above the dark clear color and was swamped by glyphs on any
text line — effectively invisible even when the wash was being
drawn correctly. 0.22 reads as a current-line band while staying
below Selection's 0.30. Static analysis of the full wire path
(daemon sweep → multi_frontend broadcast → reader → apply_attach_
message → peer_background_rects) found no break, so faint alpha is
the leading explanation for "still nothing."
2. Env-gated diagnostic in the PresenceUpdate arm. Running with
`PMACS_GPU_DEBUG_PRESENCE=1` prints each received presence
(frontend, buffer, current buffer, cursor, selection). If presence
lines appear, the wash geometry/alpha was the issue; if none appear,
the broadcast isn't reaching the mirror and the next step moves to
the daemon side. Off by default — no effect on normal runs.
Gates: fmt clean; clippy -p pmacs-gpu -D warnings clean; pmacs-gpu
unit 15.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Levi Neuwirth
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