Rewrote the handling of timeline in QGraphicsView. Now we use the built in...
Rewrote the handling of timeline in QGraphicsView. Now we use the built in zoom feature instead of a hack. Also let the view handle item move. Improves speed and stability, but broke a few things: audio thumbs and clip group action broken, probably some other minor issues. I also decided to drop the rounded clips for square ones for the moment. svn path=/branches/KDE4/; revision=2380
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