Mark comments as outdated on merged PR if code changed by another merged PR

Summary

Mark comments as outdated on merged PR if code changed by another merged PR

Steps to reproduce

1. Create a new branch from master: git checkout -b feature/test and push changes
2. Open a PR1
3. Add a comment on a changed line
4. Merge the PR1
5. Update the commented line on same feature/test branch and push changes
6. Open a new PR2
7. Merge the new PR2

What is the current bug behavior?

When we look at commented line at PR1, we see that the necessary action is not taken. But actually, we made the necessary updates with PR2. But we don't understand because PR1 doesn't show it as outdated and which PR is updated by. Which is PR2 in this example.

What is the expected correct behavior?

It should show comments as outdated on PR1 and should show reference PR, which is PR2.

Example Project

https://gitlab.com/Dentrax/issue218540/-/tree/master