Instances of `RegexError` are just asserted as `assert_not_reached` as
they cannot really fail except for allocation failure if the given regex
is valid.
For members-only, non-anonymous groups that do not have a name set we now
show an automatically generated name that is generated from the list of members
(offline, and online). Only the first name (before the first space) is used
to keep the generated name short.
The term *private room* is coined as a short hand for members only&non-anon group
chats.
This commit also uses the offline members list instead of the online member list
to generate avatar tiles (also only in members-only, non-anon groups.)
- 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.
