digiKam 5.7.0 doesn't show krita kra thumbnails

[Elle Stone]

As per the subject line, krita kra thumbnails aren't displayed in digiKam.

I only put two kra files into the test folder, so it's possible that if 
I put in several more, one or more of them might display, based on a 
similar problem from a year ago, which was the last time I tried to use 
digiKam to view Krita kra files.

I see two kde bug reports, not sure if either is relevant. But here are 
the bug report links:

https://bugs.kde.org/show_bug.cgi?id=372568
https://bugs.kde.org/show_bug.cgi?id=301543

Should I file a new bug report? Or make a post to one or both of the 
above bug reports?

Here's the library information:
KDE Frameworks 5.37.0
Qt 5.7.1 (built against 5.7.1)
The xcb windowing system

I'm running Gentoo Linux. As a test, I installed Gwenview, and Gwenview 
displayed the kra thumbnail and the embedded preview with no problem. 
But when I closed and reopened Gwenview, Gwenview couldn't display the 
thumbnail or the preview. And upon reopening again, Gwenview could 
display the thumbnail but not the preview. Etc.

Given what Gwenview is doing, this probably isn't a digiKam bug per se.

The exact same behavior was the case a year ago:

https://forum.kde.org/viewtopic.php?f=139&t=130341&p=348605&hilit=digikam+krita+kra#p348605

and two years ago:

https://forum.kde.org/viewtopic.php?f=223&t=129633&p=346885&hilit=digikam+krita+kra#p346885

The Krita version is krita-3.3.1.

Anyone have any suggestions for how to get digiKam to display Krita kra 
files?

Thanks,
Elle Stone

-- 
http://ninedegreesbelow.com
Color management and free/libre photography