Exclude tags and Union of tags in a forum channel

Currently, a user can only filter for certain tags but not filter them out. In the meanwhile, selecting multiple tags only takes the intersection of the seleted tags but not the union.

It would be nice to have a way to exclude certain tags in your search and to have an option to choose a union of multiple tags.

For example, a forum channel is created for party finding. Each post is created by a party leader to look for members, and there are tags like "looking for 1 member", "looking for 2 members" and "full". When a user is looking for a party to join, it is ideal for them to be able to choose to not see "full" parties (i.e., to exclude the "full" tag in their browsing of posts). Or the user can choose to select the union of "looking for 1 member" and "looking for 2 members". However, with the current tag selection behaviour we have, the user can only first select “looking for 1 member" tag to see a portion of the posts. if no desired party is presented, they have to unselect "looking for 1 member" tag and then select "looking for 2 members" to see more posts. This behaviour can be counter-intuitive.

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