Issue when using mixed languages and backtick ` char

v6
1

When using mixed languages, typing backtick (`) before ([{ inserts all sorts of incorrect values (see gif for more). console.log<insert backtick here>().

I think this might be a bug, here is an environment to reproduce

Screen Recording 2026-01-06 at 19.52.00 (1)

2

I’m not seeing anything unexpected happen when I type a backtick before the parentheses in the demo you linked. What browser are you using? Are there any extensions enabled that might be interfering with the editor?

3

Found the issue, it happens for Spanish keyboard layouts.

From Keyboard Event Viewer

ES Layout

Screenshot 2026-01-07 at 11.04.26

EN Layout

Screenshot 2026-01-07 at 11.05.26

4

I’m still not able to reproduce this, even with dead key backticks.

5

I was able to reproduce it on two different macOS laptops. Here is more information about my device that I hope will be useful. I can also try later on a Windows machine.

OS: Tahoe 26.2 | Sequoia 15.7.3
Browsers: Chrome 143.0.7499.192 | Firefox 146.0.1 | Brave 1.85.118
Extensions: None

Keyboard layout defaults read ~/Library/Preferences/com.apple.HIToolbox.plist AppleSelectedInputSources

(
    {
        InputSourceKind = "Keyboard Layout";
        "KeyboardLayout ID" = 87;
        "KeyboardLayout Name" = "Spanish - ISO";
    },
        {
        "Bundle ID" = "com.apple.PressAndHold";
        InputSourceKind = "Non Keyboard Input Method";
    },
        {
        "Bundle ID" = "com.apple.CharacterPaletteIM";
        InputSourceKind = "Non Keyboard Input Method";
    }
)
6

The content in the screencast is different from the content in the demo you linked, but even if I create content resembling the screencast, I don’t see the issue occur.

7

Sorry, I forgot to save after changing the editor content. It should be easy to reproduce using the screencast information.

Here is some additional information based on tests I ran:
• It works as expected on Windows with the Spanish layout.
• I was able to reproduce the issue on a third macOS machine using both Firefox and Chrome

The issue appears to be real. Personally, I think it will not affect many users (macOS + Spanish layout + mixed languages), and it is something I can work around. I would therefore understand if the issue remains unresolved.

8

It probably affects every type of composition, not just Spanish keyboard dead keys.

I was able to reproduce this, but only when using the outdated @codemirror/view from your demo. Upgrading to 6.39.9 removed the problem. So I think this was another symptom of issue 1654.

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