Fix dependencies across directories

[mcollina]

Fixes a regression introduced in #401 where dependencies across different prefixes were not taken into account.

[jean-michelet]

Looks good, but is it possible to write a test that proves the bug is fixed? And to avoid same regression in the future?

[mcollina]

Looks good, but is it possible to write a test that proves the bug is fixed? And to avoid same regression in the future?

It's covered by moving the file plugin-d.js as you can see in the diff.

[jean-michelet]

Ok, missed it.