IME composition Enter is treated as "send" (Japanese/CJK input unusable)

[dim0627]

Screen.Recording.2026-06-13.at.13.17.03.mov

Summary

When composing text with an IME (Japanese/Chinese/Korean), pressing Enter to confirm the conversion candidate instead submits the message. The composition is sent half-converted, making the app effectively unusable for CJK input.

Steps to reproduce

1. Set OS input source to Japanese (or any IME).
2. Focus the task/chat input.
3. Type にほんご, press Space to convert to 日本語.
4. Press Enter to confirm the conversion.

Expected: Enter confirms the IME candidate; text stays in the box.
Actual: The message is submitted immediately, often with unconfirmed/partial text.

Environment

• Git commit: f073b75 (current main HEAD).
• OS: macOS (Darwin 25.5.0). The buggy handlers live in the renderer, so this is not OS-specific — it reproduces with any IME on any OS (Japanese, Chinese, Korean).
• Provider: Provider-agnostic. The bug is in the input keydown handlers and does not depend on the agent provider (reproduces with Claude Code, Codex, etc.).

A screen recording of the repro will be attached below.

Root cause

The keydown handlers submit on Enter && !shiftKey without checking whether an IME composition is in progress. Affected inputs:

• app/src/renderer/hub/TaskInput.tsx
• app/src/renderer/hub/AgentPane.tsx (FollowUpInput)
• app/src/renderer/pill/Pill.tsx
• app/src/renderer/logs/LogsApp.tsx

Fix

Guard each submit-on-Enter branch with !e.nativeEvent.isComposing && e.keyCode !== 229. PR incoming.