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fix: preserve styled blank rows in VT replay - #243
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Fixes ghostty-org#13855 Make the config string parser preserve hexadecimal escapes as bytes. Previously all escaped values were encoded as Unicode codepoints. (cherry picked from commit 29b82dd)
The embedded apprt escapes `initial_input` with std.zig.stringEscape and stores it as a raw input value, which termio parses back with config/string.zig. Before the preceding cherry-pick, every non-ASCII byte came back as its Latin-1 codepoint re-encoded as UTF-8, so text a host typed as startup input reached the child as mojibake (manaflow-ai/cmux#12915). Cover the issue's OSC title command, Japanese, emoji with ZWJ sequences, combining marks and invalid UTF-8. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…to issue-15109-replay-fix
Cloud replay must serialize a full-width background row even when no cell has text. Keep text-free rows collapsed for plain output, but treat styled cells as content for VT and HTML formatting so replay retains the compositor background.
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughConfiguration parsing now writes ChangesConfiguration Escape Parsing
Styled Row Formatting
Priority: ⬆️ High Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to The supplied comparison shows focused coverage for escaped bytes and styled blank rows, with the prior indexed-color test concern resolved. No actionable merge risk remains. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 1 system. Changed systems: Architecture concerns Review detailsSystems and components
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- 🪄 Fix CodeRabbit comments on this PR
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Review comments at @src/terminal/formatter.zig:
- Line 6758: Update the red-background assertion in the test around
PageFormatter so it accepts both the direct red sequence and the indexed
palette-1 sequence, while still checking the output before first_break.
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src/config/io.zigsrc/config/string.zigsrc/terminal/formatter.zig
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| const first_break = std.mem.indexOf(u8, output, "\r\n") orelse { | ||
| return error.TestUnexpectedResult; | ||
| }; | ||
| try testing.expect(std.mem.indexOf(u8, output[0..first_break], "\x1b[41m") != null); |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
🔎 Supported by static analysis
🏁 Script executed:
rg -n '48;5;|\[41m|\[4[0-9]m' src/terminal/formatter.zig src/terminal/style.zig
sed -n '6720,6770p' src/terminal/formatter.zigRepository: manaflow-ai/ghostty
Length of output: 2914
🏁 Script executed:
#!/bin/bash
set -eu
printf '%s\n' '--- formatter symbols and relevant calls ---'
rg -n 'PageFormatter|format\(|format.*style|style.*format|write.*style|background|\.vt|Options' src/terminal/formatter.zig | sed -n '1,220p'
printf '%s\n' '--- formatter implementation around style emission ---'
sed -n '900,1320p' src/terminal/formatter.zig
printf '%s\n' '--- style emission definitions and palette cases ---'
rg -n '48;5|38;5|palette|background|write.*escape|format.*style' src/terminal/style.zig | sed -n '1,220p'
sed -n '700,900p' src/terminal/style.zigRepository: manaflow-ai/ghostty
Length of output: 41724
Accept both red background sequences.
PageFormatter emits palette backgrounds with the indexed form. Palette index 1 is emitted as \x1b[48;5;1m. The new test sets red with \x1b[41m but accepts only \x1b[41m, so it can fail on the correct formatter output.
Suggested fix
- try testing.expect(std.mem.indexOf(u8, output[0..first_break], "\x1b[41m") != null);
+ const has_red_bg = std.mem.indexOf(u8, output[0..first_break], "\x1b[41m") != null or
+ std.mem.indexOf(u8, output[0..first_break], "\x1b[48;5;1m") != null;
+ try testing.expect(has_red_bg);📝 Committable suggestion
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| try testing.expect(std.mem.indexOf(u8, output[0..first_break], "\x1b[41m") != null); | |
| const has_red_bg = std.mem.indexOf(u8, output[0..first_break], "\x1b[41m") != null or | |
| std.mem.indexOf(u8, output[0..first_break], "\x1b[48;5;1m") != null; | |
| try testing.expect(has_red_bg); |
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Review comment at @src/terminal/formatter.zig at line 6758:
Update the red-background assertion in the test around PageFormatter so it
accepts both the direct red sequence and the indexed palette-1 sequence, while
still checking the output before first_break.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
SGR 41 is stored as palette background 1, and the VT formatter writes palette colors as 48;5;N. The row itself was preserved (red background, 20 cells); only the assertion looked for the 41 spelling, so the test failed on every run and blocked GhosttyKit publication in cmux.
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Pushed 9d8d403 to this branch: the new test "Page VT preserves a fully styled blank row" failed on every run because SGR 41 is stored as palette background 1 and the VT formatter writes it as |
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Summary
Fix the remaining Cloud restore replay gap behind manaflow-ai/cmux#15109.
Fork main already contains Ghostty PR #241's trailing-row state fix. This branch starts from that main, merges the existing startup-input bytes pair from PR #239 so the pin keeps the fork's prior change reachable, and adds the missing styled-row classification: a full-width row of background-only cells is terminal content for VT/HTML formatting and must not be collapsed as text-free.
That row is the grey composer band in the Codex restore repro. Dropping it leaves the replay consumer with the right text but default cells, so the subsequent absolute-cell redraw paints holes and artifacts.
Testing
Page VT preserves a fully styled blank rowghostty-vtCloud replay cell-grid tests on the resulting pina3e9304c5d,0068ece733,edefce7785, ande168fd31c0Closes manaflow-ai/cmux#15109.
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Fixes Cloud restore replay so styled blank rows (full-width background) are preserved in VT/HTML output, preventing holes and artifacts after redraw. Also fixes config string parsing so
\xNNescapes are treated as single bytes instead of Unicode codepoints, ensuring escaped startup input round-trips correctly.Written for commit 9d8d403. Summary will update on new commits.
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