Dolphin no longer generates thumbnail previews for any comic book files with the standard .cbz and .cbr extensions. dolphin is 16.08.1-1 kio is 5.26.0-2 unzip is 6.0-12 unrar is 1:5.4.5-1 Everything is on an up to date x86_64 Arch Linux install. Reproducible: Always Steps to Reproduce: 1. Have all the requisite binaries installed (unzip / unrar) 2. Turn on Preview in Dolphin, and check the option for Comic book previews in settings Actual Results: No thumbnails are created for either .cbz OR .cbr files Expected Results: New thumbnail previews for the relevant files It bears mention that the .cbr bug has been documented here: https://bugs.kde.org/show_bug.cgi?id=341305 The .cbz bug is completely new, however.
I fixed this on my system by adding the mime type "application/vnd.comicbook+zip" to the list associated with the comicbookthumbnail service. Append it to the "MimeType" list in "/usr/share/kservices5/comicbookthumbnail.desktop" and run "kbuildsycoca5"
Forgot to say that this only fixed the thumbnails for .cbz files. I think the issue with .cbr archives is completely different.
I also found the reason for the missing thumbnails of cbr archives and commented about it in Bug 370390
Sorry, wrong reference. It's Bug 367626
I just noticed that a fix has been committed already 3 days ago.
I can confirm that this works for .cbz thumbnail generation. Thank you, Massimiliano Torromeo. Considering how (relatively) simple this fix is, hopefully it finds its way upstream soon.