SUMMARY STEPS TO REPRODUCE 1. Install kde-style-qtcurve-qt5 v: 1.9-7+b2 from repository. 2. Change to QtCurve in System Settings > Application Stile. 3. Set 'single-click' in System Settings > Workspace Behavior OBSERVED RESULT Open Dolphin & single-click on folder. Nothing happens. Only opens if double clicked. EXPECTED RESULT Single click should open file or folder. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Debian 11 "Bullseye" (available in About System) KDE Plasma Version: 5.20.5 KDE Frameworks Version: 5.78.0 Qt Version: 5.15.12 ADDITIONAL INFORMATION: Only happens with QTCurve application style, & have tried this on 3 desktops & 1 laptop.
Must be a bug in the QtCurve theme.
Just to add:- QtCurve works perfectly well in Debian 10.9. KDE Plasma Version: 5.14.5 KDE Framework Version: 5.54.0 QT Version: 18.08.0 Dolphin Version:20.12.2 kde-style-qtcurve-qt5 v: 1.9-7+b2