[dolphin] [Bug 452109] New: Dolphin Thumbnail issue

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https://bugs.kde.org/show_bug.cgi?id=452109

            Bug ID: 452109
           Summary: Dolphin Thumbnail issue
           Product: dolphin
           Version: 21.12.3
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: issue137 at trash-mail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY

Dolphin doesn't show thumbnails on FUSE filesystems.

STEPS TO REPRODUCE
1. dd if=/dev/zero of=test bs=1M count=1K
2. mkfs.ntfs -F test
3. mkdir /media/tmp; mount.ntfs-3g test /media/tmp
4. mkdir /media/tmp/test; cp <some-picture-file> /media/tmp/test/; chmod -R 777
/media/tmp
5. Navigate to the /media/tmp folder in Dolphin and turn on previews.

OBSERVED RESULT

You will see that the test-folder doesn't show the thumbnail of the file in it.
It works on all other filesystems, but not on filesystems mounted via FUSE.

EXPECTED RESULT

The folder should show the thumbnail of the file in it.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: tested on Fedora 35 and Ubuntu 21.10 (with 22.04 repo in apt)
Dolphin: 21.08.1 works correctly, 21.12.2 has the issue

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