Fails to detect external refactoring usages

[max-ellis]

Context

In projects that have submodules, we cannot detect refactoring usages outside of the file that it occurs in.

Solution

Use the IntelliJ project structure API to add a submodule to the project structure as a source folder.

[max-ellis]

I have resolved this by using the IntelliJ ModuleRootManager API. I add the source and test root for each refactoring. If the root already exists in the module, I skip that root to avoid unnecessary indexing.