[Bug 310633] New: Poor error message when trying to create a folder that already exists

[Bernd Oliver Sünderhauf]

https://bugs.kde.org/show_bug.cgi?id=310633

            Bug ID: 310633
          Severity: normal
           Version: 4.9.3
          Priority: NOR
          Assignee: kdepim-bugs at kde.org
           Summary: Poor error message when trying to create a folder that
                    already exists
    Classification: Unclassified
                OS: Linux
          Reporter: pancho.mz at riseup.net
          Hardware: Chakra
            Status: UNCONFIRMED
         Component: folders
           Product: kmail2

When trying to create a folder that already exists, the following error message
is displayed:
"Could not create folder: Could not create collection foo resourceId: 12"

This is not always that obvious as kmail might not be subscribing the folder,
so there should be an indication that a folder with this name already exists.
"Could not create folder 'foo' because it already exists in [name of
resource/folder]. " => OK

Ideally the user is informed of that fact that the folder is not displayed
because it is not subscribed, so the error message would ask something like:
"Could not create folder 'foo' because it already exists in [name of
resource/folder]. Do you want to subscribe this folder?" => [Yes] / [No]

After clicking [OK] In the first case, or [No] in the second case, the input
dialog underneath the error message shouldn't be closed, so the user can try
again rightaway.
When clicking [Yes] in the second case, the "Manage local subscriptions" dialog
should be opened instead, marking the line with the concerned folder.

Reproducible: Always

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