Dolphin no longer generates thumbnails for some image files when previews are enabled, although Gwenview sees them properly. This appears to be related to extensions being inverted, such as a jpg file having the extension png or the other way around.
This exact same problem existed in past versions of openSUSE / KDE, was fixed afterward, but has returned in openSUSE 13.2. It’s likely not a KDE issue however… because in openSUSE 13.1 I used KDE 4.14.2, and in 13.2 I retained this KDE version. So I assume some settings might be involved? Anyone got any idea where the problem might lie?
I asked about this on IRC, and am being told shared-mime-info might be at fault. I’m seeing openSUSE 13.1 had version 1.1, whereas openSUSE 13.2 has version 1.3. Perhaps someone can compare the two versions to be sure?
To replicate the problem, just take any jpg file and rename it to png. Hovering over it causes the tooltip to say “png”, whereas previously it would say “jpg”, even while the extension was png. The practical problem of course, is that preview thumbnails are not generated.
[EDIT] I noticed that “kmimetypefinder ./file” returns the incorrect type based on extension, whereas “kmimetypefinder --content ./file” returns the correct type based on MIME, if this is of any importance.
mircea@linux-qz0r:~/Downloads> kmimetypefinder ./x.png
image/png
(accuracy 100)
mircea@linux-qz0r:~/Downloads> kmimetypefinder --content ./x.png
image/jpeg
(accuracy 50)
mircea@linux-qz0r:~/Downloads>