Issue with recent CVS commit...

I recently did a 'cvs up', and I'm having some... issues.. with one commit:

cvs repository 06/20/2008 [email protected]
  ...
  lib/scan.tcl, lib/folder.tcl: fix the stale scan cache problem  

The problem is that this is a little *too* agressive in fixing the stale cache.

What happens to me:

1) Change to 'inbox', which has several thousand items in it. See several
dozen 'new' items, deal with them.

2) Change to another mailbox, deal with the new items in it.

3) New new mail arrives and gets sorted via procmail into various folders.

4) Now if I change to any of those folders, only the last 100 items are visible
because the timestamp check on '.' says the cache is 'invalid'.

5) Now I get to sit there and wait while I hit 'rescan folder'.  Of course,
the *next* e-mail that arrives I end up back at (4).

This is *very* painful if you have folders with 10K or 20K messages in it
(very possible - if you're subscribed to the linux-kernel list, that's some
500-600 messages a *day* - the above breakage and only rescanning 100 means
that I can't even get back to see messages from earlier today without rescanning)

Does anybody have a better description of what "stale cache problem" this
is trying to solve?  Is it the one mentioned below, or something else?

For the record, the *biggest* staleness issue that *I* encountered before
this is that if you have your scan format set to scan.timely or similar,
the new stuff is scanned and (since it's less than 24 hours ago) gets an
HH:MM format used.  Then after a few days, it's *still* HH:MM because it's
never been rescanned.  However, invalidating the cache when '.' gets updated
isn't sufficient, because the issue persists even if there *hasn't* been any
new mail added - if I get mail today into a folder, and I come back in a week
and there's no new mail, that scan cache is *still* stale.

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