[dolphin] [Bug 502270] New: sftp copy cannot continue if nearly finished

https://bugs.kde.org/show_bug.cgi?id=502270

            Bug ID: 502270
           Summary: sftp copy cannot continue if nearly finished
    Classification: Applications
           Product: dolphin
           Version: 24.12.3
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
  Target Milestone: ---

SUMMARY
If I copy files from the poorly performing Server of my University using its
poorly performing wifi, the copy regulary stops.
First the rate goes to 0 B/s, then it reports the inability to read the remote
file. I guess, this is a kind of timeout.
If I copy the file again it continues from the *.part file as expected.
If however, this timeout occurs when the file is nearly finished copying (99%
done; around 50kB remaining), the copy will not continue. It displays the same
error (“File <remote File> cannot be read.” (translated from German))
instantly.


STEPS TO REPRODUCE
1. Copy a file from a sftp server
2. Have it coincidentally time out at 99 %
3. Try to continue the download

OBSERVED RESULT
Refuses to continue

EXPECTED RESULT
Continues

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 6.14.0-1-MANJARO (64-bit)
KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION
I though if i could make the 99 % part file reproducible and came up with the
following:
Get a file.
Truncate it a little using truncate.
Try to download it.
This reproduces the error, but I do no know if this is a valid approach.

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