Comment # 17 on bug 969768 from Wolfgang Bauer

(In reply to Hot Music Fan from comment #16)
> If this is not a Dolphin-related issue, feel
> free to reassign the bug against other component.

We only have "KDE Workspace" and "KDE Applications" in the openSUSE bugzilla,
reassigning makes no sense.
I was just mentioning it for completeness, and it is important when filing an
upstream bug report which I am going to do probably.

> In /tmp the generated items are not only folders but files too - I have
> found that there are exact copies of single trashed picture files, just with
> name like the one you've mentioned.

Right, this is *not* restricted to folders, I noticed that too meanwhile.
Also single files are copied to /tmp when the preview/thumbnail is generated
(i.e. when previews are enabled in general and for this particular filetype and
you hover the mouse over it).

So it's not a specific problem of the "folder" thumbnailer.

But in this case, at least the file in /tmp does get deleted as soon as the
thumbnail has been generated.

I think the problem is that "trash:/" is considered to be a remote/network
protocol, so the files are being "downloaded" to /tmp by the KDE libraries to
be able to access them.