Make the base fuzzy cached per block type

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/BlockType.java

@@ -48,6 +48,7 @@ public class BlockType {
     private final String id;
     private final Function<BlockState, BlockState> values;
     private final AtomicReference<BlockState> defaultState = new AtomicReference<>();
+    private final AtomicReference<FuzzyBlockState> emptyFuzzy = new AtomicReference<>();
     private final AtomicReference<Map<String, ? extends Property<?>>> properties = new AtomicReference<>();
     private final AtomicReference<BlockMaterial> blockMaterial = new AtomicReference<>();
     private final AtomicReference<Map<Map<Property<?>, Object>, BlockState>> blockStatesMap = new AtomicReference<>();
@@ -156,6 +157,10 @@ public class BlockType {
         });
     }
 
+    public FuzzyBlockState getFuzzyMatcher() {
+        return updateField(emptyFuzzy, () -> new FuzzyBlockState(this));
+    }
+
     /**
      * Gets a list of all possible states for this BlockType.
      *

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/FuzzyBlockState.java

@@ -37,11 +37,16 @@ public class FuzzyBlockState extends BlockState {
         super(blockType);
     }
 
-    @SuppressWarnings("unchecked")
-    @Override
-    public BlockState toImmutableState() {
+    /**
+     * Gets a full BlockState from this fuzzy one, filling in
+     * properties with default values where necessary.
+     *
+     * @return The full BlockState
+     */
+    public BlockState getFullState() {
         BlockState state = getBlockType().getDefaultState();
         for (Map.Entry<Property<?>, Object> entry : getStates().entrySet()) {
+            //noinspection unchecked
             state = state.with((Property<Object>) entry.getKey(), entry.getValue());
         }
         return getBlockType().getDefaultState();
@@ -110,6 +115,9 @@ public class FuzzyBlockState extends BlockState {
          */
         public FuzzyBlockState build() {
             checkNotNull(internalState);
+            if (values.isEmpty()) {
+                return internalState.getBlockType().getFuzzyMatcher();
+            }
             FuzzyBlockState blockState = new FuzzyBlockState(internalState.getBlockType());
             for (Map.Entry<Property<?>, Object> entry : values.entrySet()) {
                 blockState.setState(entry.getKey(), entry.getValue());