Bug 400350

The scroll wheel in the "Play Media" playlist view of DragonPlayer controls both the volume *and* the scrollbar on the listview when the mouse is in the playlist listview.

This is even more confusing when the volume bar is not visible.  The user can be scrolling up and down the playlist of files and accidentally adjust the volume when the scrollbar reaches the top or bottom. 


STEPS TO REPRODUCE
1. Click the "Play Media" button to show the playlist listview.
2. Add enough files to Dragon player or resize the window so that the scrollbar appears.
3. Position the mouse over the listview and scroll up and down.
4. (Bonus) Hide the volume slider to showcase additional potential confusion.

OBSERVED RESULT
Notice that once the scrollbar reaches the top of the playlist listview, the volume begins to increase.  Once the scrollbar reaches the bottom, the volume decreases.

EXPECTED RESULT
The scroll wheel on the mouse should not control the volume while the mouse is within the playlist listview.

Additionally, it would be nice if the entire scroll-to-change volume behavior was togglable.  However even with a toggle, the scroll wheel should not control volume while inside the playlist listview.


SOFTWARE VERSIONS
(available in About System)
KDE Plasma Version: 5.14.2
KDE Frameworks Version: 5.51.0
Qt Version: 5.11.2