[discussion] synchronization of code copied from Maven core

[slawekjaranowski]

We can find classes like:
https://github.com/apache/maven-mvnd/blob/master/daemon/src/main/java/org/mvndaemon/mvnd/plugin/CliMavenPluginManager.java

Where we have comments:

This file is based on maven DefaultMavenPluginManager and changed in order
to better support parallel builds. See #310

But the based on class can change ... like in: apache/maven#285

Should it be synchronized, tracked in some ways?

[gnodet]

Ideally, the rewritten maven classes would be adapted to either support mvnd use cases or to allow mvnd to derive a class instead of having to rewrite it.

[gnodet]

#633 has removed a few classes already