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tree view instead of a flat view.

>>
>> Yet doing so would probably break displaying the Qt4 interfaces as
>> flat view. I don't know if someone cares.
With this shoutcast thing, flat view is not working. I could fix this
and keep the flat view, but it may need some Qt only code in the
playlist. That's not easily maintainable.
>
>  I care, I usually view playlist as flat view (and treeview don't expand
>  all open on default, thats the reason actually that I don't use it).
>
I could add an expand-all option.