[kmail2] [Bug 479951] New: Kmail sometimes deletes saved attachments when opened through KMail interface

[NMD]

https://bugs.kde.org/show_bug.cgi?id=479951

            Bug ID: 479951
           Summary: Kmail sometimes deletes saved attachments when opened
                    through KMail interface
    Classification: Applications
           Product: kmail2
           Version: 5.22.3
          Platform: Debian stable
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: bugsnmd at gmail.com
  Target Milestone: ---

Created attachment 164987
  --> https://bugs.kde.org/attachment.cgi?id=164987&action=edit
Screenshot of file deletion dialogue

SUMMARY

Sometimes when right clicking and saving an attachment in kmail, if you click
then 'open file' option that appears in the Kmail dialogue, you can view / 
edit the file, but on closure Kmail sometimes deletes the file.
Sometimes it will do so with a message giving you the choice to delete the file
- which is unexpected and may lead to the wrong user choice - but also at least
once it has seemed to delete the file on closure without any user input.

STEPS TO REPRODUCE
1. Open a message in Kmail that has attachment(s), through a single click in
the message list
2. Right click, save as on the attachment. Save to disk
3. Click open file in the dialogue that appears (which also allows an 'open
folder' option). 
4. Edit file, save/close
5. Kmail / Plasma sometimes presents a dialogue asking if you still wish to
delete the 'supposedly temporary file', despite it having been manually saved
to user folders.

OBSERVED RESULT
Kmail/KDE sometimes - but not always - presents a dialogue where the default
option is to delete the edited file.

EXPECTED RESULT
Closure leaves file unchanged, as it has been saved by the user.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian 12, Kernel version - 6.1.0-17-amd64
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION
This bug does not appear on every attempt but has been observed a number of
times and carries a risk of data loss.

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