Decoration not applied to diff editors when "fontWeight" decoration is set

[fabiospampinato]

Does this issue occur when all extensions are disabled?: I don't know how to reproduce it without extensions because I'm using an extension for applying these decorations.

• VS Code Version: 1.107.1
• OS Version: macOS 12.5.1 (Monterey)

Steps to Reproduce:

1. I have my "Highlight" extension installed.
2. The default configuration for it should be able to reproduce the issue.
3. Put two files in a comparison editor, I use my "Diff" extension for that.
4. Write a todo like this somewhere in either file: "//TODO: askdjnaskjdn"
5. Notice how the "//TODO:" part of is is not decorated, but the rest of is.
6. Notice how removing the "fontWeight" decoration from the setting actually causes the whole thing to be highlighted, but it should just work with that decoration too, no idea why that breaks it.

Screen recording of me reproducing the issue:

Screen.Recording.2026-01-11.at.16.00.25.mov

[vs-code-engineering]

Thanks for creating this issue! It looks like you may be using an old version of VS Code; the latest stable release is 1.108.0. Please try upgrading to the latest version and checking whether this issue remains.

Happy Coding!

[fabiospampinato]

I can reproduce the issue identically in v1.108.0 (latest)

[aiday-mar]

Hi this seems to be caused by the highlight extension. Please file this issue with the extension.

[fabiospampinato]

Aiday Marlen Kyzy (@aiday-mar) caused by the extension how? that's my extension, I'm just applying some decorations, they work outside of the diff editor but not inside the diff editor, how is that a problem with the extension exactly?