- This should not affect the performance of the completion, since all
object extensions are collected on the last step, when all main variants
are already collected
- Add more tests
- Also, disable completion of extensions from objects as callable
references (^KT-37395 Fixed)
- ^KT-36860 Fixed
- Add extensions only when completion of static members is enabled (double ctrl + space and nonempty prefix)
- Add full import for callables with receiver in `LookupElement.decorateAsStaticMember`