I'm quite impressed how nostr:nprofile1qy88wumn8ghj7mn0wvhxcmmv9uq3qamnwvaz7tmwdaehgu3wd4hk6tcqyprqcf0xst760qet2tglytfay2e3wmvh9asdehpjztkceyh0s5r9cpvx58v coded this in nostr:nprofile1qy88wumn8ghj7mn0wvhxcmmv9uq3qamnwvaz7tmwdaehgu3wd4hk6tcqyz4fq3ej2cpa4n20s9pqjdt8ju6kdh3mrcs2392hku5v80jvd2zyk8p4hdy , got notifications, but only when I was directly mentioned.
Discussion
It's actually quite simple: The logged in user must either: (i) be the author of one of the posts in the branch of the thread that is being replied to or (ii) be directly mentioned or quoted in the text itself.
The key of (i) is to only show replies that the user has participated on instead of anything that just tags the user.