Provide a way to track changes in upstream source code

[minwoox]

We copy and paste code from upstream classes if we need to modify the source code.
This is one of the examples.
If the copied source code is changed due to bug fixes or improvements, we also need to modify our code.
If we provide a way to tell the upstream change, (e.g. when we update dependencies), it would be a lot easier to maintain our code.