Instance "hide" per user without hiding notifications

[rhaamo]

When using "hide everything from instancefoobar" it hides really everything, including notifications from users of instancefoobar who are following you.

Is it possible to make it work like the "mute user" with optionally hide notifications or not ?

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• I searched or browsed the repo’s other issues to ensure this is not a duplicate.
• This bug happens on a tagged release and not on master (If you're a user, don't worry about this).