smplayer volume control

[Andre Robatino]

For a long time now, the smplayer (from RPMFusion) volume control is
vertical, instead of horizontal, with a negligible height, so it's
essentially useless. This is still true with the latest version
smplayer-16.1.0-1.fc23, and even after deleting ~/.config/smplayer. Do all
Fedora users see this, and can it be fixed?