Insert a separator character after tab-completed nickname at start of line

[Zash]

When tab-completing (and inserting a reference) a nickname at the start of the line, it would be nice if a , or : character was inserted after, so that the resulting sentence reads nicely. Eg Nickname, could you do the thing? or Youthere: Have you seen the thing yet?. This is common behavior in many other chat clients and, at least in English, the resulting sentence looks sane.

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[Nyco]

Warning:

• mentions do not always start a message
• mentions can be used in the middle or at the end of a message
• mentions do not always need punctuation, sometimes mentions need no comma or column punctuation

Desktop Team Chats which do not add a separator: Slack, Gitter, Discord, Google Hangouts Chat, RocketChat (and desktop interpersonal messengers: WhatsApp, Telegram, Facebook Messenger, Google Hangouts aaaand no mentions in Hangouts)

But most messengers use a different colour for the mention, both in the input field while still typing, and when the message is sent/received (even edited/corrected). Also most messengers add a space character after the mention. Some (not the majority) remove the "@" sign.