LineCommentEditor submits comment when pressing Enter to confirm IME composition #16360

Description

When using a CJK (Chinese/Japanese/Korean) IME in the browser version of OpenCode, pressing Enter to confirm an IME candidate selection in the LineCommentEditor textarea unintentionally submits the comment.

The root cause is that the on:keydown handler in LineCommentEditor did not check event.isComposing (or the legacy event.keyCode === 229 for Safari), so the Enter key fired during IME composition was treated as a submit action.

Reproduced in: Safari and Chrome.

Plugins

No response

OpenCode version

1.2.20

Steps to reproduce

1. Open OpenCode in a browser
2. Open a comment editor
3. Enable a CJK input method
4. Click into the LineCommentEditor textarea
5. Start typing characters — IME composition begins (underline appears)
6. Press Enter to confirm the IME candidate

Expected: the composed character is committed to the textarea, composition ends
Actual: the comment is submitted immediately

Screenshot and/or share link

Operating System

macOS

Terminal

No response