Jonas Dreßler authored Feb 02, 2019 and Florian Müllner committed Apr 17, 2019

Work around a known regression from [1] that caused the volume bar in
the OSD window to never be hidden, even if the volume is set to 0. This
happened because the border radius of the barLevel is always drawn
without ensuring that the actual bar is visible.

So simply check if the value to draw is 0, and if it is, don't draw the
border radius of the bar at all. This will still result in incorrect
representation of values that have a width smaller than 2*border-radius,
but at least the bar looks right for a width of 0 now.

[1] GNOME/gnome-shell!2

GNOME/gnome-shell!384