the back button is enable when playlist is empty

After removing all songs, we can also click the back button,if we start it using conmand 'vlc test.mp3'.playlist

changed the description

@fuzun please check it if this is a problem.

I have just checked, and I was able to reproduce the issue. Thanks for reporting, one of us is going to take a look at how to fix it.

changed milestone to %Qt redesign (VLC 4.0)

added Component::Interface: Qt label

mentioned in merge request !173 (merged)

closed with merge request !173 (merged)

changed milestone to %4.0