Note that this issue only appears in window mode. In fullscreen mode, the audio level slider works as expected.
Steps to reproduce:
1. Open video with player
2. Drag the audio level slider to the left (Setting volume to minimum)
The volume decreases but the sound is still hearable.
The volume should decrease to zero, effectively muting audio. The optimum would be that if the audio level slider is set to the minimum, audio would be muted and that fact would be indicated by the players' speaker icon
Workaround (if any):
merged as PR 756commit e791181