GenIdea: Use synthetic scala-SDK entry for compiler setup #3154
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Previously, we attached the compiler setup to the scala-library entry. This doen't work well for Scala 3 projects, since there multiple scala-library entries are present, one for Scala 2 and one for Scala 3. If the Scala 2 version comes first, IJ uses the wrong compiler setup.
This change splits the scala-library from the compiler setup. The compiler setup now becomes a dedicated synthetic
scala-SDK
library entry for each Scala module. The scala-library no longer has any special semantic and is just an ordinary jar. Only one scala-SDK entry is added to each Scala module resulting in a proper setup.Fix #2867