[Bug 151916] New: kmail dimap folder uploads status of all messages on sync

[Bonne Eggleston]

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http://bugs.kde.org/show_bug.cgi?id=151916         
           Summary: kmail dimap folder uploads status of all messages on
                    sync
           Product: kmail
           Version: 1.9.7
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs kde org
        ReportedBy: b.eggleston gmail com


Version:           1.9.7 (using KDE 3.5.7, Gentoo)
Compiler:          Target: i686-pc-linux-gnu
OS:                Linux (i686) release 2.6.22-gentoo-r5

This one is fairly simple. When synchronising a disconnected imap folder with the imap server ALL of the message flags are uploaded to the server (not just the ones which are changed). This leads to very slow synchronisation (and occupies the majority of time for my particular setup).

I'm currently using the gmail IMAP service. 

I think one simple solution would be to store somewhere, for each message, whether it's status has changed since the last sync, and only upload the statuses of these messages. 

A side effect of this bug is that during the synchronisation messages get marked as "unread" on the server (I think until the "read" status flag is sent).