[dolphin] [Bug 457935] Conflict with MIME type and preview

[MILAS Robin]

https://bugs.kde.org/show_bug.cgi?id=457935

--- Comment #2 from MILAS Robin <milas.robin at live.fr> ---
I don't see the issue content so I will add it back there.
I've got an issue with my custom thumbnailer. I checked it and my thumbnailer
work and even produce thumbnail for the parent folder.
However, the preview of the file is not displayed on the file in question.
The file is a gamecube ISO file. It seems that dolphin use the generic ISO
("raw CD image" MIME:"application/x-cd-image") instead of its dedicated MIME:
"application/x-gamecube-rom".
"xdg-mime query filetype" does correctly report the file as an
"application/x-gamecube-rom".
Dolphin seems to inconsistently use both MIME as the preview work on the parent
folder but not on the file in question as well as proposed programs are the one
for "application/x-cd-image" ignoring totaly the
"application/x-gamecube-rom"associated programs.

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