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kotlinlang

This probably isn’t Kotlin-specific, but when I’m attaching sources in the debugger, and I have the sources on my local machine (it’s a Gradle project), which directory specifically should I choose within that project when the “Choose sources…” dialog appears?

What definitely should work is directory under which subdirectory layout matches packages. But generally marking any parent root should be ok, IDEA can scan all subdirectories and look for your directory by itself, if not, then it can be a bug.