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claude-code - 💡(How to fix) Fix [BUG] IME (Korean input method) toggle does not work inside Claude Code terminal without switching focus [1 comments, 2 participants]

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anthropics/claude-code#45055•Fetched 2026-04-09 08:14:21
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After updating to v2.1.96, switching between Korean and English input using the IME toggle key (한/영 key — a dedicated hardware key on Korean keyboards that switches between Hangul and Latin input modes at the OS level) does not work while the cursor focus is inside the Claude Code terminal. The input method change only takes effect after switching focus away (e.g., Alt+Tab or clicking another window) and returning.

Error Message

Error Messages/Logs

No error messages. The IME toggle silently fails with no output.

Root Cause

After updating to v2.1.96, switching between Korean and English input using the IME toggle key (한/영 key — a dedicated hardware key on Korean keyboards that switches between Hangul and Latin input modes at the OS level) does not work while the cursor focus is inside the Claude Code terminal. The input method change only takes effect after switching focus away (e.g., Alt+Tab or clicking another window) and returning.

Code Example

No error messages. The IME toggle silently fails with no output.
RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Description

After updating to v2.1.96, switching between Korean and English input using the IME toggle key (한/영 key — a dedicated hardware key on Korean keyboards that switches between Hangul and Latin input modes at the OS level) does not work while the cursor focus is inside the Claude Code terminal. The input method change only takes effect after switching focus away (e.g., Alt+Tab or clicking another window) and returning.

Steps to Reproduce

  1. Open Claude Code terminal (Windows)
  2. Press 한/영 key (Korean IME toggle key) to switch input mode
  3. Expected: input method switches immediately (e.g., from English to Korean or vice versa)
  4. Actual: IME toggle has no effect until focus leaves and returns to the terminal

Environment

  • OS: Windows 11
  • Claude Code version: v2.1.96
  • Input method: Microsoft Korean IME (한/영 key)
  • Interface: Claude Code TUI (terminal)

Expected Behavior

한/영 key should toggle the IME input mode immediately without requiring a focus switch.

Additional Context

This issue appeared after updating to v2.1.96. Likely related to how the TUI captures raw keyboard input on Windows, which may be intercepting or consuming the IME mode-switch event before the OS can process it.

What Should Happen?

한/영 key should toggle the IME input mode immediately while the Claude Code terminal is in focus, without requiring the user to switch focus to another window and back.

Error Messages/Logs

No error messages. The IME toggle silently fails with no output.

Steps to Reproduce

  1. Open Claude Code terminal on Windows
  2. Start typing in English
  3. Press 한/영 key (Korean IME toggle key) to switch to Korean input
  4. Try to type Korean characters
  5. Observe: characters still come out in English (IME did not switch)
  6. Alt+Tab to another window, then Alt+Tab back to Claude Code
  7. Observe: now Korean input works — the toggle was applied but delayed

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

v2.1.96

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response

extent analysis

TL;DR

The issue can likely be resolved by modifying how the Claude Code terminal captures raw keyboard input on Windows to properly handle the IME mode-switch event.

Guidance

  • Investigate the keyboard input handling mechanism in the Claude Code terminal to identify why the IME toggle event is being intercepted or consumed before the OS can process it.
  • Consider implementing a workaround to manually trigger the IME mode switch when the 한/영 key is pressed while the terminal is in focus.
  • Review the changes made in version v2.1.96 to determine what specifically caused the regression and if there's a way to revert or modify those changes to fix the issue.
  • Test the input method switching with other keyboard shortcuts or methods to see if the issue is specific to the 한/영 key or a broader problem with input method handling.

Example

No specific code example can be provided without more details on the implementation, but the fix might involve adding a custom event handler for the 한/영 key press to manually switch the input method.

Notes

The exact solution will depend on the specifics of how the Claude Code terminal handles keyboard input and interacts with the Windows IME. The issue seems to be related to changes made in version v2.1.96, so comparing the input handling code between this version and the last working version could provide insights.

Recommendation

Apply a workaround to manually handle the IME toggle event when the 한/영 key is pressed, as this approach can potentially resolve the issue without requiring a full version upgrade or significant code changes.

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