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The EWS server is only able to handle around 100 items inside a request at a time. This applies to all requests that accept multiple items. To allow mass item updates it is necessary to split large series into chunks. This change applies this modification to the mail item update job. Updates are split into 10-item chunks. While it is well under the limit, such a small chunk size does not increase overhead too much and it allows more responsive progress reporting. The modification also adds progress reporting, now that the infrastructure is there. This should additionally fix the Akonadi socket timeout errors that could have been caused by the resource being busy for long periods of time without any message sent to/from the resource. A dedicated helper template class has been added to help reduce boilerplate when adding chunk splitting into more request types. Signed-off-by: Krzysztof Nowicki <krissn@op.pl>
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