[kdemultimedia] [Bug 453553] New: Dolphin not caching thumbnails

[David Karlsson]

https://bugs.kde.org/show_bug.cgi?id=453553

            Bug ID: 453553
           Summary: Dolphin not caching thumbnails
           Product: kdemultimedia
           Version: 22.04.0
          Platform: Archlinux Packages
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: ffmpegthumbs
          Assignee: unassigned-bugs at kde.org
          Reporter: davikar80 at gmail.com
  Target Milestone: ---

SUMMARY
 I am using Dolphin under WSLg (with Windows 11) and have a filesystem mounted
with drvfs (9p).
And while Dolphin is generating the video thumbnails as it should, none of them
are cached under ~/.cache/thumbnails.
Caching is working as normal on the root filesystem.
(I'm assuming this is handled by ffmpegthumbs, but it could be Dolphin too).

Fully updated Arch, with KDE Plasma 5.24.5 and KDE Gear 22.04 running under
WSLg.

STEPS TO REPRODUCE
1.  Mount filesystem with drvfs.
2. Browse filesystem with Dolphin.
3. Find video files and wait for thumbnails to generate.
4. Look for cached thumbnails under ~/.cache/thumbnails/.

OBSERVED RESULT
~/.cache/thumbnails/ is empty except for folders like normal, large, x-large.
(Assuming it was emptied before browsing).

EXPECTED RESULT
There should be cached thumbnails in the folders.

SOFTWARE/OS VERSIONS
Windows:  Windows 11 with WSL/WSLg
Linux/KDE Plasma:  Arch Linux
KDE Plasma Version:  5.24.5
KDE Frameworks Version:  5.93.0
Qt Version: idk, the latest one

ADDITIONAL INFORMATION

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