[kio-extras] [Bug 451408] File preview on some locally-mounted drives (NTFS, NFS, SMB) inappropriately use remote preview settings

[Méven Car]

https://bugs.kde.org/show_bug.cgi?id=451408

--- Comment #20 from Méven Car <meven29 at gmail.com> ---
To those concerned, this change was intentional.

NFS, SMB, SSHFS are not local file-systems, as such previewing files on those
can be slow, network-intensive and lowers the overall performance when browsing
such filesystem.
We have been plagued by bugs about those network filesystems and their
limitations especially when mounted using mount/fstab. This makes it harder to
categorize as remote which they are. We recently made some progress on that
front, and that's the cause of this behavior change and the bug in the
NTFS/fuse case.

Unfortunately, this impacted NTFS fuse-mounted fs. We wrongfully categorize
them as remote FS (because historically fuse usecases were remote filesystems).
We can improve upon this situation but this is not very clear how yet.
Details in comment https://bugs.kde.org/show_bug.cgi?id=451408#c10
I have made a lot more researches and the situation is that our libraries come
short to help.
I have opened a bug upstream that if fixed would help solve the NTFS issue
https://github.com/tuxera/ntfs-3g/issues/36

There is a very simple workaround to all of those issues in Dolphin > General >
Preview, crank up the file limit size for which to compute previews for remote
files, as much as you feel is needed.

Still folders preview won't be affected as they require a lot more work to
obtain a preview, they are currently disabled for remote filesystems. That
might be something we can improve upon, offering an option for instance.

We might revert the change to please users, but I'd rather fix the issues, now
that they are exposed.

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