SUMMARY The thumbnail/preview function of GPX files in Dolphin does not work any more. The generic file icon will be displayed instead. There may be a bug in the thumbnailer of Marble. STEPS TO REPRODUCE 1. Make sure to have Marble installed. 2. Enable the preview of GPX files in Dolphin's settings. 3. Try to open a preview of a GPX file by pressing F11. OBSERVED RESULT Generic file icon. EXPECTED RESULT Preview of the GPX file. SOFTWARE/OS VERSIONS Operating System: Manjaro Linux KDE Plasma Version: 5.24.6 KDE Frameworks Version: 5.96.0 Qt Version: 5.15.5 ADDITIONAL INFORMATION The GPX files I tested with can be opened by Marble itself.
On both of my machines the feature just started to work again without changing anything. So I guess some code change fixed this bug. Closing.