[dolphin] [Bug 461564] Dolphin displays thumbnails of files without read access

[Dilam]

https://bugs.kde.org/show_bug.cgi?id=461564

Dilam <pasdabonnements at gmail.com> changed:

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                 CC|                            |pasdabonnements at gmail.com

--- Comment #1 from Dilam <pasdabonnements at gmail.com> ---
I agree. And it's what is asked by the standard : "Programs should first check
that the original image file is readable. If it is not, the program should not
attempt to read a thumbnail from the cache, and it should not save any
information in the cache (including "failed" thumbnails)."
https://specifications.freedesktop.org/thumbnail-spec/latest/thumbsave.html#id-1.7.7

This usually isn't a problem because having access to the thumbnail means that
the user had access to the file before.
But it become an issue if someone try to save space by sharing the thumbnail
folder between multiple people with different level of access.

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