[dolphin] [Bug 499241] Dolphin jpeg preview only shown when previews are disabled for images from a specific source

[Gergely HORVÁTH]

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

--- Comment #3 from Gergely HORVÁTH <horvathg.1988 at gmail.com> ---
Interesting. I generally
- use Mozilla Firefox (134.0.1-1 on Arch)
- Right click the image
- click "Open image in new tab", that opens only the image in a new tab
- Right click that image -> "Save image as", and that is a jpeg
I just tested what you said and it does download a webp when directly saved
from the page. And interestingly it is not reproducible with Chromium, there
the image in the new tab stays a webp. It still happens with todays image
(Chromium keeps it a webp, Firefox "open image in new tab" results in a jpeg,
with which dolphin strugles presenting the preview, until I disable previews
for jpeg).

I don't know what is happening when clicking Open image in new tab, I thought
maybe FF is converting webp to jpeg for some reason. However, going to
https://kde.org/, scrolling KDE applications down all the way to Krita (just
above devices), the Krita image is a webp (the above images seemed png or svg),
clicking right click to save tries to save it as a webp, but opening it in a
new tab, it still downloads as a webp. No conversion there.

So another idea: maybe bonjourmadme is using some kind of blog engine that
convert images for presentation?

Maybe it is my resolution: 2880x1800 scaling factor: 150% (maybe firefox is
doing some rescaling that is why it ends up with a jpeg?). 

Does any of it helps to reproduce?

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