Fix some piston operations where pistons have their state toggled mid-operation

src/main/java/com/sk89q/worldedit/blocks/BlockType.java

@@ -320,6 +320,10 @@ public enum BlockType {
         shouldPlaceLast.add(BlockID.VINE);
         shouldPlaceLast.add(BlockID.LILY_PAD);
         shouldPlaceLast.add(BlockID.NETHER_WART);
+        shouldPlaceLast.add(BlockID.PISTON_BASE);
+        shouldPlaceLast.add(BlockID.PISTON_STICKY_BASE);
+        shouldPlaceLast.add(BlockID.PISTON_EXTENSION);
+        shouldPlaceLast.add(BlockID.PISTON_MOVING_PIECE);
     }
 
     /**
@@ -346,13 +350,15 @@ public enum BlockType {
      */
     private static final Set<Integer> shouldPlaceFinal = new HashSet<Integer>();
     static {
-        shouldPlaceLast.add(BlockID.SIGN_POST);
-        shouldPlaceLast.add(BlockID.WOODEN_DOOR);
-        shouldPlaceLast.add(BlockID.WALL_SIGN);
-        shouldPlaceLast.add(BlockID.IRON_DOOR);
-        shouldPlaceLast.add(BlockID.CACTUS);
-        shouldPlaceLast.add(BlockID.REED);
-        shouldPlaceLast.add(BlockID.CAKE_BLOCK);
+        shouldPlaceFinal.add(BlockID.SIGN_POST);
+        shouldPlaceFinal.add(BlockID.WOODEN_DOOR);
+        shouldPlaceFinal.add(BlockID.WALL_SIGN);
+        shouldPlaceFinal.add(BlockID.IRON_DOOR);
+        shouldPlaceFinal.add(BlockID.CACTUS);
+        shouldPlaceFinal.add(BlockID.REED);
+        shouldPlaceFinal.add(BlockID.CAKE_BLOCK);
+        shouldPlaceFinal.add(BlockID.PISTON_EXTENSION);
+        shouldPlaceFinal.add(BlockID.PISTON_MOVING_PIECE);
     }
 
     /**

src/main/java/com/sk89q/worldedit/scripting/RhinoCraftScriptEngine.java

@@ -61,7 +61,7 @@ public class RhinoCraftScriptEngine implements CraftScriptEngine {
             if (e instanceof WrappedException) {
                 Throwable cause = ((WrappedException) e).getCause();
                 if (cause instanceof WorldEditException) {
-                    throw ((WrappedException) e).getCause();
+                    throw cause;
                 }
             }