[kmail2] [Bug 363130] New: Dragging attached messages to folders looks as if it works, but doesn't

[Gunter Ohrner via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=363130

            Bug ID: 363130
           Summary: Dragging attached messages to folders looks as if it
                    works, but doesn't
           Product: kmail2
           Version: 5.1.3
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: commands and actions
          Assignee: kdepim-bugs at kde.org
          Reporter: kdebugs at CustomCDROM.de

This might lead to "lost" messages:

If you have a message with another message attached, you can drag this attached
message (dragging the "Embedded Message" link) to another mail folder.

A popup dialog will open "Copy here / Cancel" and if you choose "Copy", you
will have the impression that you just copied the embedded message as a new
message to the destination folder.

In fact, kMail instead silently refuses to perform the action and nothing will
be copied.

(While experimenting with this behaviour I noticed that the DnD target dialog
will be shown for any attempted DnD operation, regardless of the object's MIME
type. So you can also eg. drop attached ICS files to a mail folder, which of
course also fails, but does not give any feedback that it did. My expectation
would be that kMail does not indicate drop functionality for incompatible MIME
types, but allows to drop embedded messages as new messages as it's a
compatible data format. And in any case, kMail should complain if the operation
cannot be completed successfully, and should never fail silently without
notifying the user!)

Reproducible: Always

Steps to Reproduce:
1. Send yourself an eMail with another message attached and open the received
email.
2. Drag the embedded message to any email folder by dragging the "Embedded
Message" link onto a folder it in the folder list - the mouse pointer will
change to a "DnD copy" symbol - and dropping it there.
3. Select "Copy here" from the popup menu which will appear.

Actual Results:  
Nothing happens, the message will NOT be copied and there will be NO error
message.

Expected Results:  
The dropped message should appear in the destination folder if the mouse
pointer indicates that it is possible to drop it there. If it's not possible to
drop it, the mouse pointer should indicate this by showing the "DnD forbidden"
symbol.

In any case, an error message should indicate that the DnD operation was not
successful if it fails for whatever reason.

This behaviour might lead to information loss, if someone collects important
information / messages in a mail folder and fails to move in important message
there due to this bug. In this case, the message which failed to copy will be
"out of focus" and the task or information contained might be forgotten. This
nearly happened to me. => severity "Major".

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