Leaving a comment in a file in a merge request should not expand comment threads that you have manually collapsed in the same file
### Problem to solve
Open a MR and leave a comment on a file. Collapse that discussion thread. Leave another comment on a different line in that file. The first discussion thread will un-collapse.
### Intended users
A software engineer trying to review code.
### Further details
If a comment thread is particularly long this will also screw up the page scrolling disrupting your place in the MR.
### Proposal
If a comment is manually collapsed, do not expand it when a new comment is made.
### Permissions and Security
No permission or security issues.
### Documentation
No documentation update needed.
### Testing
Write a test case for leaving a comment on a file which has already collapsed discussion threads.
### What does success look like, and how can we measure that?
A discussion thread collapse feature that behaves how users expect it to.
### What is the type of buyer?
Everyone: this behavior is expected.
### Links / references
issue