validation false-positives in diff editor

[OmarTawfik]

This validation is very helpful when editing workflow files:

languageservices/workflow-parser/src/model/convert.ts

Line 113 in 4280a96

context.error(job.ref, new Error("Unable to find reusable workflow"));

But unfortunately, it runs not only on opened VS Code editors, but on diff editors as well. And in diff editors, it triggers false positives on all relative file paths. Example:

I suspect this might be because diff editors have different file url scheme, so it is unable to consolidate that with file:// lookup?
Additionally, it triggers on both the before and after file editors.

I wonder if it is possible to detect diff editors, and skip running this kind of validation when not possible?
Thank you.