[dolphin] [Bug 441123] New: Dolphin does not create, save thumbnails

[Christoph]

https://bugs.kde.org/show_bug.cgi?id=441123

            Bug ID: 441123
           Summary: Dolphin does not create, save thumbnails
           Product: dolphin
           Version: 21.08.0
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: site+org.kde.bugs-2020.jf92jmm at s.firc.de
                CC: kfm-devel at kde.org
  Target Milestone: ---

Dolphin seems to only create thumbnails (~/.cache/thumbnails) of files that are
themselves in the cache directory.


STEPS TO REPRODUCE
1. Delete ~/.cache/thumbnails
2. Open ~/Pictures/Digi (162 pictures, thumbnails are shown)


OBSERVED RESULT
No thumbnails are created in ~/.cache/thumbnails, but the "large" and "normal"
directories are created, albeit remaining empty.


EXPECTED RESULT
Thumbnails are created in ~/.cache/thumbnails/{large,normal}/ in the normal
fashion.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 21.08.0
KDE Plasma Version: 21.08.0
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2 (built against 5.15.2)


Interesting: When copying the aforementioned Digi directory (holding 162
pictures) into ~/.cache/ and viewing it, the thumbnails in ~/.cache/thumbnails
are created.
My ~, ~/Pictures, and ~/.cache are all separate btrfs subvolumes on different
physical drives, and LUKS volumes.

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