Blocks should now be fully removed correctly so that they don't drop items.

src/com/sk89q/worldedit/DoubleArrayList.java

@@ -60,6 +60,14 @@ public class DoubleArrayList<A,B> implements Iterable<Map.Entry<A,B>> {
         return listA.size();
     }
 
+    /**
+     * Clear the list.
+     */
+    public void clear() {
+        listA.clear();
+        listB.clear();
+    }
+
     /**
      * Get an entry set.
      *