https://bugs.kde.org/show_bug.cgi?id=460723

--- Comment #1 from Jan Rathmann <jan.rathm...@gmx.de> ---
Hypothesis after investigating a bit (I hope it's not totally wrong):

* Recently, the camera RAW images plugin has been added to KImageFormats
(source: changelog of frameworks 5.99):
https://invent.kde.org/frameworks/kimageformats/-/commit/eefb8146d360879e85c5136401303a99d7b0c845#1a471716951fdc5029dbe12eb74a4bbfa952c59c

* The "imagethumbnail" preview type in Dolphin seems to feel responsible for
_every_ image mimetype ( "image/*" ), see:
https://invent.kde.org/network/kio-extras/-/blob/master/thumbnail/imagethumbnail.json

So in combination with the camera RAW images plugin in place, checking the
"Images (GIF, PNG, BMP, ...) " entry in preview settings now implicitly also
covers RAW files even though one may have explicitly deselected the "raw image"
entry.

Not only raw files are affected: There is e.g. a separate entry for JPEG images
in the preview settings. If I deselect it, thumbnails for JPG files are
displayed nevertheless when "Images (GIF, PNG, BMP, ...) " is selected. So it
effectivly does nothing unless one disables previews for all images.

== Idea ==
Perhaps it would be good solution, if the imagethumbnail preview type would
only apply to all image files _not_ covered by separate preview types (BMP,
PNG, PCX etc; _not_ JPEG or RAW files)?

== (Horrible) workaround  ==
Deleting the file
/usr/lib/x86_64-linux-gnu/qt5/plugins/imageformats/kimg_raw.so will stop new
RAW thumbnails being generated (to remove the existing ones, purging
~/.cache/thumbnails should help).

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