* implemented infrastructure for undo/redo of playlist operations,
everything regarding playlist modification is now tunneled through
the playlist window


git-svn-id: file:///srv/svn/repos/haiku

* implemented infrastructure for undo/redo of playlist operations,
everything regarding playlist modification is now tunneled through
the playlist window


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21312 a95241bf-73f2-0310-859d-f6bbb57e9c96

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