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Bram Matthys
0874e376bc
When sending to channel members this will cache full IRC protocol
lines, including message tags and \r\n, for similar clients.
This avoid the need for many mtags_to_string() calls and also
entire parts of sendbuf_to_one() can be skipped as well.
The "Similar clients" cache entries are defined as clients that:
1) Are of the same type: normal local client, ircop local client
or remote client.
2) Have the same CAPs set, that is: we only look at CAPs that actually
have anything to do with message tags ('clicaps_affecting_mtag')
3) Optionally there can be an explicit line_opts. It is not used yet
but could be used when there are different type of lines sent
depending on other criteria, such as chanop status or something
else that doesn't fit in #1 and #2.