VLC saves garbage as playlist window position
First it looked like another Win32 issue - playlist window disappearing...
But the problem is reproducible also on Linux.
The real issue is that garbage is being saved as playlist window position. While Linux ignores that and displays the playlist window at some random place (definitely not the one where it was before), on Win32 it doesn't display it at all.
Thus we need to fix what's beeing saved as playlist window position in vlc-qt-interface.conf / vlc-qt-interface.ini