[Bug 119899]

[M-wada]

(In reply to Kent James (:rkent) from comment #134)
> I'm pretty sure that your a) and b) are both implemented by TB 19.

Very good news for many bugs!
But one bad... No performane impact by (a)? 
(Huge Mbox like [Gmail]/All Mail is very popular, and I saw a bug report by user on slowness with 136MB Junk.msf in the past...)

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https://bugs.launchpad.net/bugs/119899

Title:
  After-the-fact Filters on custom header won't match for IMAP messages

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