Adjust some synchronisation

worldedit-core/src/main/java/com/fastasyncworldedit/core/queue/implementation/blocks/CharBlocks.java

@@ -31,13 +31,14 @@ public abstract class CharBlocks implements IBlocks {
     };
     protected final Section empty = new Section() {
         @Override
-        public synchronized char[] get(CharBlocks blocks, int layer) {
+        public char[] get(CharBlocks blocks, int layer) {
             // Defaults to aggressive as it should only be avoided where we know we've reset a chunk during an edit
             return get(blocks, layer, true);
         }
 
         @Override
-        public synchronized char[] get(CharBlocks blocks, int layer, boolean aggressive) {
+        public char[] get(CharBlocks blocks, int layer, boolean aggressive) {
+            synchronized (this) {
                 char[] arr = blocks.blocks[layer];
                 if (arr == null) {
                     arr = blocks.blocks[layer] = blocks.update(layer, null, aggressive);
@@ -55,6 +56,7 @@ public abstract class CharBlocks implements IBlocks {
                 }
                 return arr;
             }
+        }
 
         @Override
         public boolean isFull() {

worldedit-core/src/main/java/com/fastasyncworldedit/core/queue/implementation/blocks/CharGetBlocks.java

@@ -24,7 +24,7 @@ public abstract class CharGetBlocks extends CharBlocks implements IChunkGet {
     }
 
     @Override
-    public boolean trim(boolean aggressive) {
+    public synchronized boolean trim(boolean aggressive) {
         for (int i = 0; i < sectionCount; i++) {
             sections[i] = empty;
             blocks[i] = null;