Improve maximum mention count limit

[Hoto-Cocoa]

💡 Summary

Currently, Misskey has mention count limits for every note, by default of 20 mentions.

So, If I mention 18 users in A instance and 3 users in B instance in one note, this note has 21 mentions, so this note will not be accepted.

Also, If I mention users more than limits on that note, that note will just not be accepted and federated, even if all the mentioned users are mutually following the note author.

This note has 22 mentions but is not spam; all mentioned users are in a mutual following state with the note author, and I'm not mentioning more than 20 users in one instance.

hoto.moe (local, 7)
k.lapy.link (remote, 4)
nekoplanet.xyz (remote, 3)
social.silicon.moe (remote, 2)
stella.place (remote, 1)
daepi.so (remote, 1)
prism.place (remote, 1)
gameguard.moe (remote, 1)
cremebrul.ee (remote, 1)
munochi.moe (remote, 1)

Now I wish:

• Not include mention in count If that user is a remote user
• Not include mention in count If that user is mutually following state with note author

So I was planning to just implement this myself and open PR, but I don't know why this was implemented like this, so now I'm open this issue. If this is not an intended action, I will implement it myself and open a PR. Please let me know.

Thanks.

🥰 Expected Behavior

• Not include mention in count If that user is a remote user
• Not include mention in count If that user is mutually following state with note author

🤬 Actual Behavior

• Include mention in count If that user is a remote user
• Include mention in count If that user is mutually following state with note author

📝 Steps to Reproduce

No response

💻 Frontend Environment

No response

🛰 Backend Environment (for server admin)

* Installation Method or Hosting Service: Docker compose
* Misskey: 2024.3.1
* Node: 20.10.0
* PostgreSQL: 15
* Redis: 7
* OS and Architecture: Ubuntu 20.04.4 LTS

Do you want to address this bug yourself?

• Yes, I will patch the bug myself and send a pull request