Before this rev., the default filters were ignored in Discuss. The
SearchView was instantiated and correctly retrieved the default
filters. However, a first manual 'do_search' needs to be done by
the client action for the search view to provide the domain, and
for Discuss to correctly filter the messages.
Steps to reproduce the issue:
- In Discuss (e.g. in Inbox), add to Favorites a given search,
and tick 'Use by default'
- Leave Discuss, and then go back: the default filter correctly
appears in the search view, but the messages aren't filtered.