(why did that even work before)

also fix some typos in the comments, and a refresh issue with the input

(since we can’t do anything about them anyway)

Often, we search people but don’t actually want to open a tab with them
(maybe the users wants to talk to a specific resource, or see the contact’s
status, or things like that)
To open a tab to talk to this contact, the user just need to type Enter twice

For example 😆

it might be a little slower than before (more checks)

Now each different match has a different priority.
It might need some tuning to have the desired result.

Archiving old logs is recommended before running this update,
just in case.

see #2142

see #2142

Some characters take 0 columns, others take 1 or 2 (full-width characters)

fixes #2142

We can now change the keepalive values with /set, without restarting

Using add_configuration_handler() we can now set a callback to be called
whenever a given option value is changed using /set

Because that message doesn’t make any sense if you are in the room and you
get a nick conflict from the /nick command.

it didn’t make anything crash, but still.