SUMMARY In my triple-head system, dragging a desktop file icon between desktops results in move/copy/link context prompt. Dragging on the same desktop has expected behaviour of repositioning icon. SOFTWARE/OS VERSIONS Windows: MacOS: KDE Plasma Version: 5.12.7 KDE Frameworks Version: 5.47.0 Qt Version: 5.9.5
Likely fixed by https://cgit.kde.org/plasma-desktop.git/commit/?h=Plasma/5.12&id=1fe0175b66607d1e8299554aa0d54eb9664169d1