[Bug 309486] New: [feature request][kmail] checksum SHA for IMAP mail, detect broken message body and redownload from server

[Marek Otahal]

https://bugs.kde.org/show_bug.cgi?id=309486

            Bug ID: 309486
          Severity: major
           Version: 4.9.2
          Priority: NOR
          Assignee: kdepim-bugs at kde.org
           Summary: [feature request][kmail] checksum SHA for IMAP mail,
                    detect broken message body and redownload from server
    Classification: Unclassified
                OS: Linux
          Reporter: markotahal at gmail.com
          Hardware: Archlinux Packages
            Status: UNCONFIRMED
         Component: general
           Product: kmail2

This is a feature request for the old bug of accidentally missing (IMAP) email
bodies. 
This is similar to bug https://bugs.kde.org/show_bug.cgi?id=302337 but mine
just occured on 4.9.2 (gmail).
Related:
http://forums.opensuse.org/english/get-technical-help-here/applications/474124-kmail-4-8-2-340-1-x86_64-eating-my-message-bodies.html
https://bugs.kde.org/show_bug.cgi?id=298962

This is even mentioned here: 
http://userbase.kde.org/KMail/FAQs_Hints_and_Tips#You_have_empty_.27ghost-mails.27_in_your_inbox_.28or_other_folder.29
but the solution to 'Rebuild index' is not available anymore. 

My proposal: 
a) implement again the "rebuild index"
b) SHA checksums - when downloading email, store message ID together with the
hash of whole mail in some file. 
Offer a "redownload broken" tool, that goes through all messages in given
folder, makes their hash, and if it does not match with the stored original
hash, redownload the message (messageID) from server again (for IMAP; it doesnt
have to be possible always, but for many cases-gmail-is.)

This could be a commandline tool, or a button in Kmail settings/folder menu. 

The workaround for me is quite painful: delete whole .kmail folder, set-up
accounts again and download _all_ emails from servers again. 
// maybe sometimes the ghost emails are "ok" again after restart, I'm not sure
if/how this happens.

Thank you for considering, mark

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