Shuffle mode (toggle button) that works similar to Winamp.
When toggled on, generates a new shuffle order for current context.
When toggled off, play context switches to folder of the current song, so the songs can be continued in order (may be slightly problematic for single-song folders)
The "Shuffle Play" button is actually a special case of shuffle mode, since it includes all subfolders recursively.
Shuffle mode (toggle button) that works similar to Winamp.