Negative option was leading to a fair amount of confusion, going forward
if we want to allow selection of emails from user selector it must be
supplied with `allowEmails=true`
This corrects a regression in 1f4ace4f which broke invite by emails and
start PM to email
Following this change when a user hits `@` and is replying to a topic they
will see usernames of people who were last seen and participated in the topic
This is somewhat experimental, we may tweak this, or make it optional.
Also, a regression in a423a938 where hitting TAB would eat a post you were writing:
Eg this would eat a post:
``` text
@hello, testing 123 <tab>
```
Previously we were incorrectly checking mentionable instead of messageable
Also fix edge case where multiple groups sharing a name mean that exact match override is not working
Also cleans up params sent to user selector
This relaxes our very strict username rules to allow for some long asked for requests
- leading _ is now allowed
- . is allowed except for trailing char and confusing extensions like .gif .json
- dash (-) is now permitted
The userSearch() function, used for @mention autocomplete, returned an empty
list if the query string included non-latin characters or spaces. This removes
this restriction, so you can search users by any characters in their display
name, including spaces.
