Plugin's resources for a multilingual book overridden unexpectedly

[kakkun61]

Summary

When a plugin give different resources for each language book on a multilingual book, only one set of resources is copied to _book, instead of all sets of ones.

• HonKit version: 3.7.4

Step to reproduce

1. Prepare a multilingual book
2. Use a plugin that returns different resources for each language book
   • In this example “gitbook-plugin-add-js-css” is used
3. Only last (?) resources are copied in a _book directory

• Link to code example: https://stackblitz.com/edit/honkit-template-4lsuer

Expected results

_book/gitbook/gitbook-plugin-add-js-css directory has three CSS files.

• (hashed)-style.css (contains .root { --foo: black; })
• (hashed)-style.css (contains .root { --foo: green; })
• (hashed)-style.css (contains .root { --foo: red; })

Actual results

_book/gitbook/gitbook-plugin-add-js-css directory has only one CSS file.

• 8475660b37f194a88de481bf6c110409-style.css (contains .root { --foo: black; })

[azu]

I agree that this is an odd behavior.

We would need to investigate whether this is a core or plugin issue.

• istex/gitbook-plugin-add-js-css