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Also looup -> look up

ImapInterval does not allow begin() > end().

FIXED-IN: 4.14.3
BUG: 339172

If the result of UID SEARCH is too big Exchange just disconnects. To work around
this the UID SEARCH is splitted into smaller chunks (I choose 2000 arbitrarily).

First I wanted to do this for all servers but I've a server where UIDs go up to
1 billion which results in half a million SearchJobs. So I do the splitting only
for Exchange servers. I don't know if there is a better way to recognize Exchange
servers than to look at Session::serverGreeting()?

There are still issues with Exchange but at least for me it's usable again.


CCBUG:  339393
REVIEW: 120644

triggerCollectionExtraInfoJobs was removed in 945a5cca but the
corresponding change never made it to the Kolab resource, thus it would
stop when trying to run a non existent task.

Notice that this may be a stop-gap solution (I don't know the code too
well) but seems to work.

CCMAIL: dvratil@redhat.com
CCMAIL: chrigi_1@fastmail.fm

This reverts commit d6330e59.

If the task get's externally (not by the task itself) cancelled
(i.e. by a dropped connection), the task my be running a job and once it
returns i.e. cancel the task again.

This results in ResourceBase methods getting called while no task is active,
ending in an assert.

This patch simply isolates ResourceTask once cancelTask has been called.

ResourceBase does that now for us. We do have to use synchronizeCollectionAttributes
instead of the custom task though.

If we're unlucky enough that we receive a disconnect call before a session
has been declared ready, we end up declaring the about to be deleted session.
This then results in a dangling pointer and eventually in a crash.

Needed for at least Zimbra that doesn't like
having items files named by anything else but
the incidence UID and that redirects. KIO
does not supply the username / password (as
it should), but we have no way to ask the user
for confirmation.

Many thanks to Benjamin Girault for the initial
debug, patch and testing.

BUG: 339634