- only display messages that are content items
- only display messages for active accounts
- "fix" textview issue
- add empty states (no search, no results)
Previously, you had to issue two clicks in order to enter something into
the text fields.
This also replaces the `Entry` widgets with their label counterparts
once they lose focus. Since the `ComboBox` handling of focus seems to be
buggy (`focus_out_event` not firing), the OpenPGP key selection lacks
the latter feature.
