[Bug 1074260]

[Irving]

Created attachment 679311
Update message size in database on every full message download

This undoes a behaviour change introduced in bug 740453, where we
changed from updating the message database's size field (with a
sometimes incorrect value) on every offline message download, to only
updating when the server's RFC822 size didn't match the real message
size.

With this patch, we update the DB on every complete message download
(including messages not stored offline), with the exact message size as
downloaded.

If you would prefer the patch to more closely match the old
implementation (only updating the size for offline messages) the change
won't be too complex.

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Title:
  Thunderbird heavy IMAP traffic downloading messages

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