Changelogs missing for identical notesSourceUrl deps

[philipfreude]

How are you running Renovate?

Self-hosted Renovate

If you're self-hosting Renovate, tell us which platform (GitHub, GitLab, etc) and which version of Renovate.

GitHub, v39.164.0

Please tell us more about your question or problem

Summary:
When grouping multiple deps with the same repoName and notesSourceUrl changelogs are only shown for a single dep.

Background:
We like to use renovate to update Helm charts and the docker images within them to get changelogs for both, i.e. the Helm chart and the application itself.
In this example, we would like to get changelogs for the ingress-nginx Helm chart and the ingress-nginx-controller docker image. Because they need to be updated together, we group them in a single renovate PR by using packageRules.
Unfortunately this breaks the changelogs, because the release notes for both the docker image and the helm chart are within a single GitHub repo in the case of ingress-nginx.

We created a minimal example here: https://github.com/philipfreude/ingress-nginx-renovate

Technical details:
The first issue to overcome in this example was this check, by setting a sourceDirectory for at least one of the deps.
However, the release note deduplication via the releaseNotesSources here seems to be not configurable at all.

In the ingress-nginx example the value of releaseNotesSources is "https://api.github.com/repos/kubernetes/ingress-nginx/releases" for both deps, as constructed here.

There was a similar issue #10954 a while back, but it was solved by introducing the releaseNotesSources and it only works if there are multiple Changelog.md for each of the deps. In the case of ingress-nginx the release notes are just within the GitHub releases itself, so the releaseNotesSources is identical in both cases.

Any suggestions on how to get changelogs for both deps, while still keeping them grouped?

Logs (if relevant)

Logs

 DEBUG: Removing duplicate release notes (repository=philipfreude/ingress-nginx-renovate, branch=renovate/ingress-nginx-group)
       "depName": "registry.k8s.io/ingress-nginx/controller"

[github-actions[bot]]

Hi there,

We appreciate the effort you put into creating a reproduction. But your reproduction is not minimal yet, or is missing fields we ask for in our template.

Please re-read the steps and documentation given in the previous message, and try again to create a minimal reproduction.

Thanks, the Renovate team

[philipfreude]

Updated the reproduction repo.

https://github.com/philipfreude/ingress-nginx-renovate