Includes are not added to existing project resource

[slawekjaranowski]

Affected version

4.0.0-rc-3

Bug description

In plugin (Maven 3 api) code like

project.getResources().get(0).addInclude("test");

has no efect.

Includes are not added to existing project resource.

There are no warnings or errors, that list can not by modified

[gnodet]

The underlying model does not use Resource objects anymore, see https://github.com/apache/maven/blob/c0b9106121a58f7c84e04e53d8e9c6044ef9fbb0/impl/maven-core/src/main/java/org/apache/maven/project/MavenProject.java#L822-L829 This may be fixable by wrapping the underlying SourceRoot in a smarter manner.