Created attachment 167095 [details]
Screenshot of folder view from dolphin

SUMMARY
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The thumbnails are not displayed correctly in the Dolphin file manager (see attachment file).

The user “michael” is in the following groups:
$ id -a michael
uid=1000(michael) gid=1000(michael) Gruppen=1000(michael),4(adm),20(dialout),24(cdrom),27(sudo),29(audio),30(dip),44(video),46(plugdev),50(staff),100(users),113(netdev),116(lpadmin),117(scanner),125(sambashare),129(vboxusers),5001(music),5002(photo),131(kvm),998(adbusers),997(docker)

In the screenshot you can see that the file “Z” belongs to the user root and the group “photo” has write permissions (permission 660). I can also change this because the user “michael” is in the “photo” group. Unfortunately, the lock symbol for the file “Z” is then displayed in Dolphin, which is definitely wrong. This error did not occur under Plasma5 and the thumbnails were displayed correctly, i.e. without the lock symbol.

As soon as the file permissions are 660 (see screenshot), the display in Dolphin is incorrect, as the user’s group permissions are presumably not taken into account.
***


STEPS TO REPRODUCE
1. start dolphin
2. look at the details mode

OBSERVED RESULT
lock symbol is displayed despite write access to the file

EXPECTED RESULT
correct display of thumbnails/icons if write permissions on the file allow it (group and user permissions)

SOFTWARE/OS VERSIONS
Distribution   : KDE neon 6.0
Kernel         : 6.5.0-25-generic
SystemD        : systemd 249 (249.11-0ubuntu3.12)
Plasma         : 6.0.0
Qt             : 5.15.12
Kwin X11       : 6.0.2
Kwin Wayland   : 6.0.2