[dolphin] [Bug 499241] New: Dolphin jpeg preview is reversed

[Gergely HORVÁTH]

https://bugs.kde.org/show_bug.cgi?id=499241

            Bug ID: 499241
           Summary: Dolphin jpeg preview is reversed
    Classification: Applications
           Product: dolphin
           Version: 24.12.1
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: horvathg.1988 at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Hi,
I realized that jpgs in a folder have no preview for jpg files. Pngs, webm and
everything else has jpg previews, even better in other folders jpg previews
show up. But! When I turned off previews for dolphin (Settings->Dolphin
settings->Preview->Jpeg, untick, click Apply), the thumbnails showed! When I
turn it back off, the thumbnail disapper. If I move the image between that
folder and other folders, the experience is the same.  The images I experience
it with are downloaded from bonjourmadame.fr (NSFW), so it may be the images
from that site (but the webm, png files from the same site show no trouble). I
experienced it with a single folder where I collect them, that folder is synced
to Nextcloud with the official app, but the connection may be the source of the
images.
So in summary: jpg files from that site react to "Show JPEG thumbnails"
reversed compared to what the tick suggest in dolphin. Example image: the one
from 2025-01-28 (the page uses /page/n numbering, don't see permalink option)
Hope you can look into it!
BR,
Gergely

Versions:
```sh
$ pacman -Qs dolphin
local/dolphin 24.12.1-1 (kde-applications kde-system)
    KDE File Manager
local/dolphin-plugins 24.12.1-1 (kde-applications kde-sdk)
    Extra Dolphin plugins
```

Operating System: Arch Linux 
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
Kernel Version: 6.12.9-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-6700K CPU @ 4.00GHz
Memory: 31.2 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1080/PCIe/SSE2
Manufacturer: Dell Inc.
Product Name: XPS 8910
System Version: 1.0.9

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