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This was possible on Nextcloud 30 and previous due to a "bug":
The `download` permission was simply not rejected for public shares,
just a `hide` flag was set on the public share.

Now the permissions are correctly set, so loading a preview is not possible.
The work-around is to allow previews when the correct header is set.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>