"Move class" refactoring causes code compilation errors

move class Inner into Target:
```java
package a;
class Upper {
class Inner {
}
Inner i;
}
package b;
class Target {
}
```
Code after refactoring:
```java
package a;
class Upper {
Inner i;
}
package b;
class Target {
}
class Inner {
}
```
Compile error due to moving classes not belonging to the same package.

Reproduce the "Move class" refactoring with the Java snippets in the issue, moving Inner from package a into Target in package b. Start by locating the Move class refactoring entry point and its tests; done means the moved code compiles when the source and target classes belong to different packages.

Written by the indexing model from the issue text.