477 Containers @copy fix and refactoring (ets-labs#485)

* Rename local variables

* Make code layout enhancements

* Add fix and tests

* Add more refactoring

* Update changelog

Author: rmk135

docs/main/changelog.rst

@@ -7,6 +7,12 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+Dev version
+------
+- Fix ``@containers.copy()`` decorator to respect dependencies on parent providers.
+  See issue `#477 <https://github.com/ets-labs/python-dependency-injector/issues/477>`_.
+  Thanks to `Andrey Torsunov @gtors <https://github.com/gtors>`_  for reporting the issue.
+
 4.35.2
 ------
 - Update wiring to support modules provided as packages.