Shlok Patel b3c58f454f api: Prevent special characters in topics. ...

Special characters, including `\r`, `\n`, and more esoteric codepoints
like non-characters, can negatively affect rendering and UI behaviour.

Check for, and prevent making new messages with, characters in the
Unicode categories of `Cc` (control characters), `Cs`, (surrogates),
and `Cn` (unassigned, non-characters).

Fixes #20128.

2021-11-22 22:09:06 -08:00

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