While an "Advanced Search" UI would be great, I think it could be useful for both usability and discoverability of this filtering feature to prefill the searchbar with the corresponding tag:* text when a tag is selected. To make the search filters match the current view.
This would allow to qucickly search in a tag, without knowing the syntx and th tag's slug. And I think it easy to understand that one need to remove it to search the entire forum. This is what GitHub does for example and I find it quite pleasant to work with.
It wonder if it would be possible for the flarum-tags extension to implement this with the current APIs?
