https://bugs.kde.org/show_bug.cgi?id=485572

--- Comment #5 from SC <[email protected]> ---
(In reply to Sophian Zoeller from comment #4)
> I'm experiencing the same issue on Fedora 44, KDE Frameworks 6.31.0, with
> image thumbnails (not just video). All image previews stopped working on a
> local gocryptfs FUSE mount on a directly-attached btrfs SSD.
> 
> Root cause: KIO's PreviewJob now classifies FUSE mounts as "slow/remote,"
> which subjects them to the MaximumRemoteSize limit. The default
> MaximumRemoteSize=0 in kdeglobals [PreviewSettings] means no thumbnails are
> generated for any file on these mounts.
> 
> Workaround: setting MaximumRemoteSize to a nonzero value in
> [PreviewSettings] in ~/.config/kdeglobals restores thumbnails:
> 
> kwriteconfig6 --file kdeglobals --group PreviewSettings --key
> MaximumRemoteSize 104857600
> 
> This affects all local FUSE-based encrypted mounts (gocryptfs, encfs,
> cryfs), not just video thumbnails. The fix should distinguish between
> genuinely remote FUSE mounts (sshfs, davfs2) and local-only ones.
> 
> Related: KIO MR !1534

Funny coincidence that we independently ran into this again at pretty much the
same time. I was in discussion with the author of the MR that introduced the
recent regression just yesterday:
https://invent.kde.org/frameworks/kio/-/merge_requests/2371#note_1674455.

And just to clarify the timeline for readers:
After the issue was first reported in 2024, some time later (forgot how long
exactly, but at least a few months) the problem was gone. But very recently
kio-6.31.0 includes the aforementioned MR which again caused this regression.
This puts us where we are.

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