Bug 447906 - Thumbnailer Previews Broken for kra, xcf, png (not jpg, mp4, mkv)
Summary: Thumbnailer Previews Broken for kra, xcf, png (not jpg, mp4, mkv)
Status: RESOLVED DUPLICATE of bug 447507
Alias: None
Product: frameworks-kio
Classification: Frameworks and Libraries
Component: general (show other bugs)
Version: 5.89.0
Platform: Arch Linux Linux
: VHI normal
Target Milestone: ---
Assignee: KIO Bugs
Keywords: regression
Depends on:
Reported: 2022-01-04 00:17 UTC by Loren Dias
Modified: 2022-03-14 15:10 UTC (History)
8 users (show)

See Also:
Latest Commit:
Version Fixed In:


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Description Loren Dias 2022-01-04 00:17:15 UTC
On Arch Linux with current version of packages in Dolphin, the thumbnail previews is broken for kra, xcf, png and probably others

 jpg, mp4, mkv are showing just fine.

I've narrowed down the breakage to this package:

With the previous version of this package installed io-5.88.0-1-x86_64.pkg.tar.zst the KRA thumbnails appear as expected.


1. Create a test Kritta ~/test.kra
2. Open Dolphin ~/ and see the thumbnail not load despite Previews being enabled in View, and KRA enabled in the [ Configure ] dialog

No KRA, XCF or PNG previews -- meanwhile JPG, MP4 and MKV preview just fine

Expect KRA, XCF and other files to show thumbnails


Linux/KDE Plasma:  Linux ArchBox 5.15.11-arch2-1 #1 SMP PREEMPT Wed, 22 Dec 2021 09:23:54 +0000 x86_64 GNU/Linux
KDE Plasma Version: plasma-desktop 5.23.4-1
KDE Frameworks Version: plasma-framework 5.89.0-1
Qt Version: qt5-base 5.15.2+kde+r274-1


Possibly related to 475a88870801ae304b6ed57bf54248271f2e72f4 or 60443fd2ef79442c46c30b08db3fb01dd463e0e7
Comment 1 Fabian Vogt 2022-01-04 22:19:42 UTC
FTR, there was some discussion on IRC and kioclient5 cat thumbnail://... worked as expected.

I can't reproduce the issue here with kio from git master or 9c98dd26f5 (close to 5.89).
Comment 2 Enrique 2022-01-05 14:51:57 UTC
I've observed this problem as well, there is a way to "fix" the problem and I've been able to replicate it on two Manjaro KDE 21.2.1 systems and also "fix" the problem.

In `~/.config/dolphinrc`, delete the `[PreviewSettings]` section. It will enable .kra files to show previews on Dolphin, effectively fixing the problem. Other file extensions seem to work just fine too. But, in the preview settings of Dolphin configuration GUI, the `Krita Docutments` checkbox is unticked. Ticking/Unticking this checkbox manually will recreate the `[PreviewSettings]` portion of the `dolphinrc` file and will cause the issue to come back. 

From what I was told, interacting with the GUI or the listed set of thumbnailers might be causing a problem. Not entirely sure. 

This will be contents of the `[PreviewSettings]` when I tick/untick the krita file option the preview settings for my particular systems.
Comment 3 Bug Janitor Service 2022-01-05 14:53:13 UTC
A possibly relevant merge request was started @ https://invent.kde.org/frameworks/kimageformats/-/merge_requests/46
Comment 4 Alexander Lohnau 2022-03-12 13:54:00 UTC
>In `~/.config/dolphinrc`, delete the `[PreviewSettings]` section. It will enable .kra files to show previews on Dolphin, effectively fixing the problem.

This is fixed by https://invent.kde.org/network/kio-extras/-/merge_requests/144. The config key dolphin was writing was not the same as the derived plugin id.
Comment 5 Nate Graham 2022-03-14 15:10:39 UTC

*** This bug has been marked as a duplicate of bug 447507 ***