[Bug]: Root project must not be indexed in SourceFileManager

[itsaky]

What happened?

Currently, the all projects list in IProjectManager implementation includes the root project as well (as expected). However, SourceFileManager treats the root project as a JavaModule and tries to index its source files.

What's the expected behavior?

The SourceFileManager should not index sources from the root project.

What version of AndroidIDE you're using?

v2.5.3 (debug builds)

Relevant log output

Creating source file manager instance for module:  JavaModule: :

Duplicate issues

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