Better inset bounds to improve autoscrolling while dragging in a scrollview.

AppKit/CPDragServer.j

@@ -261,7 +261,7 @@ var CPDraggingSource_draggedImage_movedTo_          = 1 << 0,
         {
             var contentView = [scrollView contentView],
                 bounds = [contentView bounds],
-                insetBounds = CGRectInset(bounds, 10, 10),
+                insetBounds = CGRectInset(bounds, 30, 30),
                 eventLocation = [contentView convertPoint:_draggingLocation fromView:nil],
                 deltaX = 0,
                 deltaY = 0;