SubMiner/docs/subagents/agents/codex-overlay-whitespace-newline-20260221T040705Z-aw2j.md

Agent Log: codex-overlay-whitespace-newline-20260221T040705Z-aw2j

• alias: codex-overlay-whitespace-newline
• mission: Fix visible overlay whitespace/newline token rendering bug (blank hoverable tokens) with regression tests.
• status: completed
• started_utc: 2026-02-21T04:07:05Z
• last_update_utc: 2026-02-21T04:14:30Z

Intent

• Reproduce bug around spaces/newlines + preserveLineBreaks in visible overlay.
• Add failing renderer/tokenization regression tests first.
• Patch render/token mapping to avoid hoverable blank tokens and preserve-mode duplication.

Touched Files

• src/renderer/subtitle-render.ts
• src/renderer/subtitle-render.test.ts
• docs/subagents/INDEX.md
• docs/subagents/collaboration.md
• docs/subagents/agents/codex-overlay-whitespace-newline-20260221T040705Z-aw2j.md

Decisions

• Ignore whitespace-only token surfaces in source alignment.
• Non-preserve mode: flatten token newlines to spaces, whitespace-only surfaces as text nodes.
• Preserve mode alignment: skip unmatched token surfaces (do not append fallback token) to avoid duplicate tail text.

Verification

• RED: new whitespace-separator test failed before fix.
• GREEN: renderer suite pass after first fix.
• RED: new preserve-mode duplicate-tail mismatch test failed before fix.
• GREEN: bun run build && node dist/renderer/subtitle-render.test.js pass (11/11).
• GREEN: node --test dist/renderer/subtitle-render.test.js pass.

Blockers

• none

Next Step

• User visual verify with preserveLineBreaks=true + known mixed-width numeral lines.
• [2026-02-21T04:18:16Z] follow-up: fixed non-token first-paint behavior to collapse line breaks when preserveLineBreaks=false (normalizeSubtitle(..., collapseLineBreaks=true) in fallback path); added regression test for normalize collapse.