Clamped Y for //expand and //contract operations.

src/com/sk89q/worldedit/Vector.java

@@ -472,6 +472,17 @@ public class Vector {
                 && getBlockZ() >= min.getBlockZ() && getBlockZ() <= max.getBlockY();
     }
 
+    /**
+     * Clamp the Y component.
+     * 
+     * @param min
+     * @param max
+     * @return
+     */
+    public Vector clampY(int min, int max) {
+        return new Vector(x, Math.max(min, Math.min(max, y)), z);
+    }
+
     /**
      * 2D transformation.
      *