Add basic CONDSTORE support when fetching initial messages.

Store MODSEQ in the header cache, and use that to perform a "FETCH
CHANGEDSINCE" for header updates when initially downloading messages.

Further improvements could be made to add support when syncing.
Handling MODSEQ for FLAG updates while the mailbox is open would be
complicated by the fact that Mutt supports locally modified headers,
so we couldn't accept the new (or subsequent) MODSEQ.

However, this initial step may at least provide some benefit when
opening the mailbox, which is generally the most time and data
intensive.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib.h b/lib.h
index 61ac700d..11638dfe 100644
--- a/lib.h
+++ b/lib.h
@@ -193,6 +193,7 @@ int mutt_atoi (const char *, int *);
 int mutt_atol (const char *, long *);
 int mutt_atoui (const char *, unsigned int *);
 int mutt_atoul (const char *, unsigned long *);
+int mutt_atoull (const char *, unsigned long long *);
 
 const char *mutt_stristr (const char *, const char *);
 const char *mutt_basename (const char *);