Nick tab-completion at the beginning of the input regressed with RTE

[eternaleye]

I remember bringing this up when it first landed, but apparently never filed a ticket.

In the old, pre-RTE editor, tab-completing a sequence of names at the beginning like foo<tab>bar<tab>baz<tab> produced a comma-separated list of names, terminated by a colon.

In short:

• foo<tab> produced foo:
• Appending bar<tab> to that produced foo, bar:
• Appending baz<tab> to that produced foo, bar, baz:

In the RTE editor, it instead inserts a pill for the first name followed by a colon, then inserts the subsequent names as if they were mere references in the body of the message.

This makes it decidedly suboptimal for addressing multiple people in a message, and requires significant time to patch up on each message.

[t3chguy]

Duplicate of #4883