fix: normalize dead-key grave input in composer

[StiensWout]

Summary

• Normalize dead-key grave look-alike composition input in the web composer before it reaches stored prompt text.
• Reuse the existing selected-text backtick surround behavior and insert ASCII backticks for collapsed selections.
• Replaces fix: normalize dead-key grave input in composer #3158 with a fresh branch based on current main.

Root cause

Some keyboard layouts emit grave-like Unicode characters (ˋ, ‵, ｀) through insertCompositionText after a dead-key press. The composer accepted those literal characters, so Markdown inline-code delimiters were not recognized.

Impact

Dead-key grave input now produces ASCII backticks only at the input boundary. Pasted text and non-dead-key Unicode content are left unchanged.

Validation

• PATH="$HOME/.vite-plus/bin:$PATH" vp check
• PATH="$HOME/.vite-plus/bin:$PATH" vp run typecheck

vp check reports the repository's existing unrelated warnings and no errors.

Closes #3142

---

Note

Low Risk
Localized Lexical input-handling in the composer editor; no auth, data, or API changes.

Overview
Dead-key grave input on some keyboard layouts was inserting Unicode lookalikes (ˋ, ‵, ｀) instead of ASCII backticks, so inline-code surround and Markdown delimiters broke.

ComposerSurroundSelectionPlugin now records plain Dead keydowns in a 1s window. When insertCompositionText delivers one of those lookalikes shortly after, it is handled as a backtick: existing surround-selected-text behavior runs when applicable, otherwise a single ` is inserted, and the lookalike is suppressed via preventDefault / propagation stops.

Modifier handling is centralized in hasCommandModifier (meta/ctrl). The dead-key tracking ref is cleared on other composition paths and normal surround handling so unrelated input is unchanged; paste and non-dead-key Unicode are not rewritten.

^{Reviewed by Cursor Bugbot for commit 6e83d9e. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Normalize dead-key grave input to backtick in composer surround-selection plugin

On macOS, pressing a dead-key grave (`) followed by a space produces a Unicode grave-lookalike character instead of a literal backtick, breaking the surround-selection feature in ComposerPromptEditor.

• Tracks the timestamp of a plain Dead keydown in recentDeadKeyDownRef to create a 1-second detection window.
• In onBeforeInput, intercepts insertCompositionText events where the data is a grave-accent lookalike character and a recent dead-key was recorded, then substitutes a literal ` and applies surround insertion if a selection is pending.
• Suppresses the default browser input of the lookalike character via preventDefault and stopImmediatePropagation.
• Adds hasCommandModifier and hasRecentDeadKeyDown helpers to unify modifier checks and dead-key age tests.

^{Macroscope summarized 6e83d9e.}

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on this repository. Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 860a17da-09d6-445d-84e2-46f6a3d68f67

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[macroscopeapp]

Approvability

Verdict: Approved

Straightforward bug fix that normalizes dead-key grave characters to backticks in the composer input. Changes are self-contained to event handling logic in one component with clear intent and limited scope.

^{You can customize Macroscope's approvability policy. Learn more.}