Source link is wrong for submodules imported in the repository

Steps to reproduce:

• go to http://extensions.xwiki.org/xwiki/bin/view/Extension/Nested+Pages+Migrator+Application
• click to "view source", you get a wrong URL:
  https://github.com/xwiki-contrib/application-nestedpagesmigrator/application-nestedpagesmigrator-ui
• FTR, the URL is described in the parent module's pom.xml: https://github.com/xwiki-contrib/application-nestedpagesmigrator/blob/master/pom.xml#L54
• If you manually change the URL in the extension page and then re-import the extension from the maven repository, the wrong URL is going back.

I suppose the URL is computed from the parent module, adding "/submodule-name" to the URL, which is wrong.

Maybe the solution is to put a <scm> tag with an <url> content inside the submodule's pom.xml.

However, I think the current behavior is wrong, and it does not even work.

In my example, I actually want to have the sources of the parent module, and I can't.