[Bug 286045] New: missing error handling in folder view / Unknown error. (Unable to fetch item from backend)

[Milian Wolff]

https://bugs.kde.org/show_bug.cgi?id=286045

           Summary: missing error handling in folder view / Unknown error.
                    (Unable to fetch item from backend)
           Product: kmail2
           Version: Git (master)
          Platform: Archlinux Packages
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: folders
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: mail at milianw.de


Version:           Git (master) (using KDE 4.7.3) 
OS:                Linux

very often when I try to view the contents of a folder, kmail2 will show a
spinner next to that folder but won't finish the view job. In the console I can
see this:

kmail2(25075)/libakonadi Akonadi::EntityTreeModelPrivate::fetchJobDone: Job
error:  "Unknown error. (Unable to fetch item from backend)"

but:
- the user won't see this in 99% of the cases as he won't check the cli output
- the folder is still shown in the "loading/spinning" status, even though the
job finished (though with an error)
- I must restart kmail2 to try again to see the contents of this folder,
probably related to the point above

I'll create another report about why this error might happen in the first place

Reproducible: Didn't try

Steps to Reproduce:
- toggle dimap account offline in akonadiconsole
- try to get folder contents of that offline account in kmail2

Actual Results:  
- endlessly spinning folder

Expected Results:  
- error message "resource is offline - go online? [yes] [no]"

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