Created attachment 132368 [details] Code of error idle-python3.8 SUMMARY Error in execute idle-python3.8 after update to plasma 3.20 STEPS TO REPRODUCE 1. I execute idle-python.3.8 2. Don't show the window OBSERVED RESULT The error appear in file attachment EXPECTED RESULT SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE plasma Neon 5.20 User Edition (available in About System) KDE Plasma Version: 5.20 KDE Frameworks Version: 5.75.0 Qt Version: 5.15.0 ADDITIONAL INFORMATION Version 64 bits
Error is: unknown color name "BACKGROUND" in Python's TCL/TK wrapper. I am not sure if TCL/TK respects the GTK color settings; if it does, it is indeed possible that Plasma writes something odd there. Reassigning for inspection.
This looks like an app/toolkit issue and not an issue with Breeze GTK; please report this bug to the app makers, they'll be better equipped to help you with it.