nah, I do not have to care about preferences - I wrote code to filter
duplicate metadata keys (something KIO:PreviewJob lacks - what if
preferred thumbnailer fails but other succeeds?)
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
ideally, the keys would also be stored in the .desktop files so that
plugin instances would not have to be created from
KFileMetaInfo::supportedKeys() too
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>