Equals to the number of uids requested.
There are corner-cases when this is not happening, we don't know yet
why this is happening but IMAP server log should do the trick.
This avoids to launch a NSException trying to access an element
outside the array bounds.
There is a use case where this has caused crashes:
A message was hard-deleted using an IMAP client, this is the first
message you deleted in that folder and you have cleared offline
items in the client so a full sync is asked by upper layer.
In that situation, the SyncLastDeleteChangeNumber version property
is not set and return 0 in [getDeletedKeysFromChangeNumber:andCN:inTableType]
making OpenChange to crash while it is asking for deleted fmids
since a given change number.
This is a regression from 18d7070c4a.
Sometimes we're trying to get the `objectVersion` of a calendar message,
but this message's entry is not in the cache. The method
`synchroniseCache` won't work in this case, so we try to force the
synchronisation of that particular message in order to get the change
number before aborting.
And perform the real IMAP operation on save method as described by
[MS-OXCFXICS] and [MS-OXCMSG] Section 2.2.3.3, these operations must be
committed when SaveChangesMessage is called.
As it is expected by Outlook to increase the change number when
performing the `SetMessageReadFlag` ROP, if it is not done, the client
tries indefinitely to store that.
Happened in an imported vevent from Mozilla Thunderbird.
The crash was:
Sep 14 15:49:38 sogod [21063]: <0x6442DBF8[SOGoAppointmentFolder]:personal> missing 'c_startdate' in record?
Sep 14 15:49:38 sogod [21063]: <0x6442DBF8[SOGoAppointmentFolder]:personal> missing 'c_enddate' in record?
2015-09-14 15:49:38.927 sogod[21063] NGCalendarDateRange.m:37 Assertion failed in NGCalendarDateRange(instance), method initWithStartDate:endDate:. startDate MUST NOT be nil!
EXCEPTION: <NSException: 0x7fb96b3c0ed8> NAME:NSInternalInconsistencyException REASON:NGCalendarDateRange.m:37 Assertion failed in NGCalendarDateRange(instance), method initWithStartDate:endDate:. startDate MUST NOT be nil! INFO:(null)
The relevant ICS file lines are the following ones:
BEGIN:VEVENT
UID:040000008200E00074C5B7101A82E00800000000901646A7234BCE01000000000000000010000000E9152C8FF1C27D488C91967FAAFCC2B0
RECURRENCE-ID:20140513T100000Z
DURATION:PT1H
CLASS:PUBLIC
ATTENDEE;PARTSTAT=NEEDS-ACTION;ROLE=REQ-PARTICIPANT;RSVP=TRUE;CN=krsny >>
Ann Thierry K:mailto:krsny@example.com
END:VEVENT
This method does not longer returns true if the content id
was a empty string.
In some case the old false positive triggered the removal of
attachments when sending messages.
