`isLocal` doesn't seem to include Stack Git `extra-dep`s

[michaelpj]

This is a problem, since this set is used to compute the set of packages for shellFor.

Evaluating selectLocalPackages in nix repl doesn't include them.

When I enter a shell, I see: trace: Shell for ... which does not include the extra-deps.

Then when I cabal v2-build it tries to build them but hits e.g. missing foreign dependencies. (yes, we use both stack and cabal...)

[michaelpj]

Okay, I resolved the issue with rebuilding the dependency that needed the foreign lib, that was actually unrelated.

It still looks like this isn't behaving the way I'd expect, but it's not causing me build issues.

[michaelpj]

Also, I'm confusing myself: this is for git dependencies added in stack.yaml. Perhaps they behave differently?

EDIT: changed the issue description to be more accurate.