As we observed one way users try to filter topics where a user participated is just to try to write their name in the search bar. By allowing to add filters based on auto-completion we can provide users with a quick option to add common filters.
In this example, the user writes a user name, and we suggest whether the user wants to add a filter for that specific user (or just search for that text being present in the content.
Some considerations:
- An icon will be shown to communicate which kind of filter is being added. That will help the user to connect the auto-completed option with the added filter, since they will look similar.
- To keep suggestions useful, a proper threshold should be set (e.g., only showing user suggestions if more than 4 characters match the username or there is a given delay).