Manage multiple inheritance situation where there is no interface information

[lmove]

Suppose interface I is declared in the studied API and interface J comes from a different JAR. How to detect possible incompatibility changes if we need information related to methods declared within J?

public interface I {
     int m();
}

public interface J {
     int m();
}

public class C implements I, J {
     [...]
}

Affected changes: methodNewDefault, methodAbstractNowDefault

[lmove]

After discussing this issue with @tdegueul we only report cases where both I and J are contained in the studied API and/or client project. Check the code correspondingly.