imapd: track characters used in IMAP tags #5055
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This extends the existing IMAP client behaviour tracking to record categories of characters used in tags
We don't have existing tests for the client behaviour logging, except for a couple of cursory checks in Simple and ID. I might feel more comfortable with some tests that verify the character class mappings detect as expected, but it'd be a whole new test suite, is it worth the effort? I dunno.