Environment

• wmux version: 0.6.1
• OS: Windows 11 Pro (10.0.26200)
• IME: Windows default Korean IME (Microsoft 입력기)
• Previously tried third-party Korean IME — same issue

Description

Korean (Hangul) composition input is unreliable. Characters sometimes get dropped, duplicated, or composed incorrectly during typing.

Root Cause Analysis

After inspecting the source (app.asar), wmux has no Korean-specific IME handling. It relies entirely on xterm.js (v5.5.0) CompositionHelper.

Potential issues found:

1. _finalizeComposition() uses setTimeout(0) which may cause race conditions during Hangul composition
2. conpty PTY layer may have character encoding issues with multi-byte Korean characters
3. Electron's textarea composition events may not sync properly with Windows 11 IME

Steps to Reproduce

1. Open wmux terminal on Windows 11
2. Switch to Korean IME
3. Type Korean characters — observe irregular composition behavior

Expected

Smooth Korean character composition, same as Windows Terminal or VS Code integrated terminal.