Improved usage of the naturalize command over large areas

This change fixes the block count report, and also makes
naturalize act more like a "//replace dirt grass" where
we only attempt block changes if the block is not already
what we're looking for.

worldedit-core/src/main/java/com/sk89q/worldedit/function/block/Naturalizer.java

@@ -27,6 +27,7 @@ import com.sk89q.worldedit.function.LayerFunction;
 import com.sk89q.worldedit.function.mask.BlockTypeMask;
 import com.sk89q.worldedit.function.mask.Mask;
 import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockTypes;
 
 /**
@@ -65,21 +66,35 @@ public class Naturalizer implements LayerFunction {
         return mask.test(position);
     }
 
-    @Override
-    public boolean apply(BlockVector3 position, int depth) throws WorldEditException {
-        if (mask.test(position)) {
-            affected++;
+    private BlockState getTargetBlock(int depth) {
         switch (depth) {
             case 0:
-                    editSession.setBlock(position, BlockTypes.GRASS_BLOCK.getDefaultState());
-                    break;
+                return BlockTypes.GRASS_BLOCK.getDefaultState();
             case 1:
             case 2:
             case 3:
-                    editSession.setBlock(position, BlockTypes.DIRT.getDefaultState());
-                    break;
+                return BlockTypes.DIRT.getDefaultState();
             default:
-                    editSession.setBlock(position, BlockTypes.STONE.getDefaultState());
+                return BlockTypes.STONE.getDefaultState();
+        }
+    }
+
+    private boolean naturalize(BlockVector3 position, int depth) throws WorldEditException {
+        BlockState block = editSession.getBlock(position);
+        BlockState targetBlock = getTargetBlock(depth);
+
+        if (block.equalsFuzzy(targetBlock)) {
+            return false;
+        }
+
+        return editSession.setBlock(position, targetBlock);
+    }
+
+    @Override
+    public boolean apply(BlockVector3 position, int depth) throws WorldEditException {
+        if (mask.test(position)) {
+            if (naturalize(position, depth)) {
+                ++affected;
             }
         }