When the user changes the filters in the search view, this one
triggers up an event to notify its environment that its state
changed. This came with the new views, as before the search view
triggered an event on itself (i.e. used 'trigger' instead of
'trigger_up'). At some point, 'trigger' will be deprecated and
'trigger_up' will be used instead, everywhere.
The code in mail hasn't been updated accordingly, so the thread
wasn't updated when the user changed the filters.
Aaron Bohy
b25ba51e6f