The dropdown selector in the media player applet can't be interacted with with the scrollwheel.
If there are multiple players currently opened - the scrollbar scrolls too fast - ending in Choose player automatically section - tried with touchpad Operating System: KDE neon Developer Edition KDE Plasma Version: 5.14.80 Qt Version: 5.11.1 KDE Frameworks Version: 5.51.0
Looks like it was fixed in some commit. Closing this