thread(algorithm, search_keys, charset) public

As for #search(), but returns message sequence numbers in threaded format, as a Net::IMAP::ThreadMember tree. The supported algorithms are:

ORDEREDSUBJECT:split into single-level threads according to subject, ordered by date.
REFERENCES:split into threads by parent/child relationships determined by which message is a reply to which.

Unlike #search(), charset is a required argument. US-ASCII and UTF-8 are sample values.

See [SORT-THREAD-EXT] for more details.

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