[Users] [Bug 2529] New: crash in mimeview_start_drag after deleting message

[noreply at thewildbeast.co.uk]

http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=2529

           Summary: crash in mimeview_start_drag after deleting message
           Product: Claws Mail
           Version: 3.7.10
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: UI/Message View
        AssignedTo: users at lists.claws-mail.org
        ReportedBy: mschwendt at gmail.com


https://bugzilla.redhat.com/show_bug.cgi?id=748384#c4
Backtrace: https://bugzilla.redhat.com/attachment.cgi?id=529776

Originally reported about 3.7.9, reproducable with 3.7.10:

1. put a single message into a local folder, a normal text/plain one will
suffice
2. select the message
3. open the mimeview parts viewer with the '<' button right of the message view
4. drag'n'drop a part other than the first one (message/rfc822) to somewhere,
e.g. drag the text/plain part into an editor/filemanager
5. Trash/delete the message
6. try drag'n'drop in the _empty_ mimeview parts window area -> crash

There may be other/similar test-cases, which would also lead to
mimeview_start_drag running into a NULL ptr.

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