Please do not automatically collapse the comment I just created when using `collapseAll`

[MetRonnie]

This is a feature request to change the behaviour of the collapseAll mode so that comments you just created do not automatically collapse.

I my opinion, collapseAll should only apply to pre-existing comments. When I post a comment I find it quite annoying that it immediately disappears, as often I want to re-read what I wrote to check the markdown rendered properly and I didn't make any mistakes or was not as clear as I could be.

Perhaps there could be a new value for the setting, called collapsePreExisting?

https://github.com/user-attachments/assets/2ba2ef64-ea79-41fb-a23c-0eddd008297b

I have

"githubPullRequests.commentExpandState": "collapseAll",

but would not expect a comment I just made to automatically collapse

Originally posted by @MetRonnie in #3345. The current behaviour is considered correct according to https://github.com/microsoft/vscode-pull-request-github/issues/3345#issuecomment-2511781215

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