[dolphin] [Bug 447664] New: Files selected and moved to another another window carry the selected flag over to the new folder.

[Henry Pfeil]

https://bugs.kde.org/show_bug.cgi?id=447664

            Bug ID: 447664
           Summary: Files selected and moved to another another window
                    carry the selected flag over to the new folder.
           Product: dolphin
           Version: 21.12.0
          Platform: Slackware Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: hpfeil at psnarf.org
                CC: kfm-devel at kde.org
  Target Milestone: ---

Two Dolphin instances, each open to folders on different drives, Detail view.
Select 40,000 files in one folder, drag/drop to the second folder, choose Move.
As each file is transferred, it appears selected in the new folder. The status
line on the destination folder shows the number of selected files increasing as
the number decreases in the source folder.

If you change directory of the source folder so those selected files no longer
appear, the remainder of the destination folder's files are not selected, the
destination number of selected files remains static, displaying the number of
selected files before the source folder changed. The selection status of the
source files follows it over to the destination.
However, if you then go back to the source folder and re-select the source
files, the destination folder's selected files remain as they were. This
suggests that only the initial selected files are moved to the destination
folder carrying their selection status with them. 

This experiment was performed while moving 46,000 images from one drive to
another, a 4+ hr process while another dolphin instance was moving 75,000 files
to a different folder at the same time.
[Typical file numbers for post-production video work. All the image frames of
the video are extracted, altered via a Gimp script, then re-assembled into a
new video. A 40Gb video produces over 3Tb of frames.]

EXPECTED RESULT
The destination files should be un-selected until they are explicitly selected
in the new folder. 

Operating System: Slackware 15.0
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.89.0
Qt Version: 5.15.3
Kernel Version: 5.15.11 (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 1700 Eight-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: Radeon RX550/550 Series

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