Using maven-processor-plugin with IDEA

IDEA seems to automatically add the default directories used by
maven-plugin-processor to the classpath:
target/generated-sources/annotation and target/generated-sources/apt.

And it does whether the plugin is used or not.

How come is IDEA adding this directories to classpath?

When configuring a specific output directory to be able to commit the
generated classes in a versioning system, IDEA doesn't take it into
account.

Example of configuration:


the path src/main/generated is not added to classpath.

Would it be possible to automatically recognize and add it to classpath?

cheers