Korean IME composition is not displayed while typing in the LINQPad 9 code editor

gregTheCrazy
gregTheCrazy
in General

I’m experiencing an issue with Korean IME input in the LINQPad 9 code editor.

Environment

  • Windows 11
  • LINQPad 9 Free, x64
  • Microsoft Korean IME
  • LINQPad 9.10.19
  • Also reproduced in LINQPad 9.11.5 Beta

Steps to reproduce

  1. Open LINQPad 9.
  2. Open a new C# query.
  3. Focus the code editor.
  4. Switch the Windows input method to Korean.
  5. Type a Korean word, for example 한글.
  6. Observe the characters while typing.

When typing 한, the Korean IME goes through the following composition states:

ㅎ → 하 → 한

Actual behavior

The intermediate composition characters are not displayed in the code editor.

For example:

  • Type ㅎ → nothing is displayed
  • Type ㅏ → nothing is displayed
  • Type ㄴ → 한 suddenly appears

The input itself appears to be processed correctly, but the IME composition is not visually rendered until the composition is committed.

Expected behavior

The currently composing Korean characters should be displayed immediately, as they are in normal text input controls.

For example:

ㅎ → 하 → 한

should be visible while typing.

Additional observations

This does not happen throughout the entire system. It only occurs in certain applications.

I tested the following:

Application / Input Area Result
LINQPad 9 Code Editor Affected
LINQPad 9 Ctrl+F search box Works normally
Rider Code Editor Works normally
Rider Claude window/input area Affected
Warp Affected
Other standard Windows applications Works normally

The fact that the Ctrl+F search box within LINQPad works normally is particularly interesting. This suggests that the Windows Korean IME itself is functioning correctly and that the issue may be specific to the code editor's IME/composition handling.

I also tested LINQPad 9.11.5 Beta, and the same issue is reproduced there.

I had not experienced this issue in LINQPad before. I recently opened LINQPad again after not using it for some time, and the issue is now present.

I searched the LINQPad forum for similar reports but couldn't find a report describing this specific behavior with Korean IME composition.

Since LINQPad 9 uses the Actipro SyntaxEditor for its code editor, I wonder if this could be related to IME composition handling or rendering in the editor component.

I can provide additional details or perform specific tests if that would help diagnose the issue.

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Answers

  • nescafe
    nescafe

    Perhaps you could reproduce the issue using On Screen Keyboard and post a screen capture?

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  • gregTheCrazy
    gregTheCrazy

    sure. here it is.

    • affected


    This video shows the issue occurring in the LINQPad 9 code editor.

    As I type Korean characters, the text is not displayed immediately. A "string completion" / completion popup window appears with each keystroke instead.

    The Korean IME composition is not visually rendered in the editor while the character is being composed. The text only becomes visible once the Korean syllable is completed.

    For example, when typing 한, the composition progresses through ㅎ → 하 → 한, but the intermediate characters are not displayed in the editor.

    • works normally


    This video shows the same Korean IME input inside the LINQPad Ctrl+F search text box.

    In contrast to the code editor, the Korean characters are displayed immediately with each keystroke while the IME composition is in progress.

    For example, ㅎ → 하 → 한 is displayed normally as each character is typed.

    This demonstrates that Korean IME input itself is working correctly within LINQPad, while the issue appears to be specific to the code editor.

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