Updates to bug 2 after Apr 2020 code push

[jesse_the_k]

The @ shortcut explodes when a period follows the username.sitename

If @username.sitename appears at the end of a sentence, like

input: The best bug hunter is @punk.ao3.

Dreamwidth fails to expand, showing the error message [ bad username or site: punk @ AO3 ] and swallowing the period. Like this:

unescaped text, throws error that includes the period: The best bug hunter is punk.

(I formatted the input sample by surrounding the at-sign with backticks.)

Current workaround:

only the period is escaped inside backticks: the best bug hunter is punk.

Prepush workaround was to add backslash before period, which no longer works

the period is escaped by a backslash: the best bug hunter is punk.

---

When the full TLD is included, user head displays correctly BUT it still swallows the period.

The best bug hunter is punk.

Also known as actually punk.

That would be runpunkrun.

Used to be runpunkrun.

Other contacting punctuation doesn't trigger the bug

Why do you read jesse_the_k? Never read jesse_the_k's terrible. She never tweets at jesse_the_k!