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@doscode-kr doscode-kr commented Oct 21, 2025

Problem

When users typed Korean (or other CJK languages) and pressed Enter, the message was submitted twice due to IME composition events:

  • First Enter: IME commits the final character → full text sent
  • Second Enter: Actual Enter keypress → last character sent again

This caused:

  • Duplicate Claude sessions (2x token waste 💸)
  • Confusing user experience
  • Unintended behavior

This issue particularly affected users in East Asia (Korea, Japan, China) who rely on IME for daily communication.

Solution

Implemented industry-standard IME composition event handling:

  1. Primary Fix: Composition Event Tracking

    • Added compositionstart and compositionend event listeners
    • Track IME state with isComposing flag
    • Ignore Enter keypress during active composition
  2. Secondary Protection: 50ms Throttle

    • Prevent rapid duplicate Enter presses
    • Acts as safety net for edge cases
    • Imperceptible to users (< human reaction time)

This is the same approach used by major web applications like Gmail, Slack, and Discord for reliable IME handling.

Testing

All 6 test cases passed in Extension Development Host:

  • ✅ TC1: Korean input → Enter → Single submission (no duplicates)
  • ✅ TC2: English input → Normal operation
  • ✅ TC3: Shift+Enter → Line break (no submission)
  • ✅ TC4: Empty input → Enter → No action
  • ✅ TC5: Disabled send button → Enter → Blocked correctly
  • ✅ TC6: Rapid Enter presses → Only first processed

Impact

  • Users: Better experience for Korean/Japanese/Chinese speakers 🎉
  • Performance: 50% reduction in duplicate API calls
  • Compatibility: Works across all platforms (macOS, Windows, Linux)
  • Scope: Isolated change, no breaking changes

Code Changes

  • File: src/script.ts (+26 lines, -1 line)
  • Lines:
    • 18-20: Add composition state variables
    • 880-887: Add composition event listeners
    • 890-909: Update Enter handler with IME checks

For East Asian Users

이 수정으로 한국어, 일본어, 중국어 사용자들의 입력 경험이 크게 개선됩니다.
더 이상 메시지가 중복으로 전송되지 않습니다! 🎊

この修正により、日本語入力での二重送信の問題が解決されます。

此修复解决了中文输入时的重复提交问题。


Note: This fix benefits all IME users worldwide, improving accessibility and user experience for non-Latin script languages.

Closes #130 and #132

## Problem
When users typed Korean (or other CJK languages) and pressed Enter,
the message was submitted twice due to IME composition events:
- First Enter: IME commits the final character → full text sent
- Second Enter: Actual Enter keypress → last character sent again

This caused:
- Duplicate Claude sessions (2x token waste 💸)
- Confusing user experience
- Unintended behavior

This issue particularly affected users in East Asia (Korea, Japan, China)
who rely on IME for daily communication.

## Solution
Implemented industry-standard IME composition event handling:

1. **Primary Fix**: Composition Event Tracking
   - Added `compositionstart` and `compositionend` event listeners
   - Track IME state with `isComposing` flag
   - Ignore Enter keypress during active composition

2. **Secondary Protection**: 50ms Throttle
   - Prevent rapid duplicate Enter presses
   - Acts as safety net for edge cases
   - Imperceptible to users (< human reaction time)

This is the same approach used by major web applications like
Gmail, Slack, and Discord for reliable IME handling.

## Testing
All 6 test cases passed in Extension Development Host:
- ✅ TC1: Korean input → Enter → Single submission (no duplicates)
- ✅ TC2: English input → Normal operation
- ✅ TC3: Shift+Enter → Line break (no submission)
- ✅ TC4: Empty input → Enter → No action
- ✅ TC5: Disabled send button → Enter → Blocked correctly
- ✅ TC6: Rapid Enter presses → Only first processed

## Impact
- **Users**: Better experience for Korean/Japanese/Chinese speakers 🎉
- **Performance**: 50% reduction in duplicate API calls
- **Compatibility**: Works across all platforms (macOS, Windows, Linux)
- **Scope**: Isolated change, no breaking changes

## Code Changes
- **File**: `src/script.ts` (+26 lines, -1 line)
- **Lines**:
  - 18-20: Add composition state variables
  - 880-887: Add composition event listeners
  - 890-909: Update Enter handler with IME checks

## For East Asian Users
이 수정으로 한국어, 일본어, 중국어 사용자들의 입력 경험이 크게 개선됩니다.
더 이상 메시지가 중복으로 전송되지 않습니다! 🎊

この修正により、日本語入力での二重送信の問題が解決されます。

此修复解决了中文输入时的重复提交问题。

---

**Note**: This fix benefits all IME users worldwide, improving accessibility
and user experience for non-Latin script languages.

Closes #[issue-number] (if applicable)
@doscode-kr
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doscode-kr commented Oct 21, 2025

I hope the team approves this PR as soon as possible. This is a serious issue for users in East Asia.

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A prompt written in Korean is entered twice sometimes

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