[kio-extras] [Bug 402721] Thumbnails in XDG thumbnailer spec compliant places are ignored by Dolphin

[probono]

https://bugs.kde.org/show_bug.cgi?id=402721

--- Comment #5 from probono <prob...@puredarwin.org> ---
Thanks azubieta for the following test case:

wget -c
"http://icons.iconarchive.com/icons/custom-icon-design/mono-general-3/256/home-icon.png";
-O ~/.cache/thumbnails/normal/646c2e0867c1bdd38aa5876337af2284.png
touch /tmp/file
xdg-open  /tmp/

A file manager that follows the XDG thumbnail spec will show a "home" icon
thumbnail for /tmp/file.

Thanks kossebau for the following analysis:

It seems like Dolphin only shows thumbnails that it knows the thumbnailer which
generated them:

https://cgit.kde.org/kio-extras.git/tree/thumbnail/thumbnail.cpp#n697 ff.

https://cgit.kde.org/kio-extras.git/tree/thumbnail/thumbnail.cpp#n90

"enabledPlugins - a list of enabled thumbnailer plugins. PreviewJob does not
call this thumbnail slave when a given plugin isn't enabled."

This may be the root cause of this issue.

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