How to search and filter solved/unsolved topics?

[alefattorini (Alessio Fattorini)]

Continuing the discussion from Solved Button Plugin:

@sam

We will have a special search query term to fine “unsolved”/“solved” topics in a category.

How can I achieve this? I looked for such query term with no luck. Any hint?

[zogstrip (Régis Hanol)]

The filters are “in:solved” and “in:unsolved”