Syntax highlitghing is broken

[tsukinoko-kun]

Description

Code shown in the TUI is not highlighted correctly.

OpenCode version

1.0.9

Steps to reproduce

Not sure where it breaks but thats the first code snippet I saw after I recently updated (I was at a version before the redesign). I assume its the + and - from the diff.

Screenshot and/or share link

Operating System

macOS 26.0.1

Terminal

Ghostty

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• No highlighting in diffs #3687: Very similar issue about missing diff highlighting in v1.0.7+ - both report problems with red/green diff highlights not working properly
• 1.0.2 - selecte theme not applied to code snippets #3646: Related issue about code snippets not using the correct theme/highlighting in v1.0.2+

Feel free to ignore if none of these address your specific case.

[kommander]

Ah yes, are there tabs in the code? There currently is an issue with tabs. Will be fixed.

[tsukinoko-kun]

Ah yes, are there tabs in the code? There currently is an issue with tabs. Will be fixed.

Yes. I use tabs for indentation.
I assume rendering the tab character wider than one character messes up the token positions?

[kellpossible]

renders this unusable for go code

[thdxr]

we're working on this