Fetch all headers for a list of messages

[stormleoxia]

Hi,

On the ImapFolderFetch.cs:

I've added the ability to fetch all headers for a list of UniqueId.
In order to do so, I remove the check on the length of fields HashSet and modified the tokens to fetch all headers in case the hashset is non null and empty.
I didn't want to change the API but maybe you'll feel that adding a new overload of Fetch methods is more appropriate.
Regards,

Fabien

[jstedfast]

This will break existing uses because the versions of the Fetch() method that do not take a HashSet<string> fields argument pass null into that method, so now any app that calls Fetch() not wanting any headers will fetch all headers.

[jstedfast]

I've implemented this in an even simpler way by adding a MessageSummaryItems.Headers flag, which, if set, will request all headers.

[stormleoxia]

Ok. Great. Thanks