Fix stack outside region

build.gradle

@@ -28,7 +28,7 @@ ext {
     date = git.head().date.format("yy.MM.dd")
     revision = "-${git.head().abbreviatedId}"
     parents = git.head().parentIds;
-    index = -72;  // Offset to mach CI
+    index = -73;  // Offset to mach CI
     int major, minor, patch;
     major = minor = patch = 0;
     for (;parents != null && !parents.isEmpty();index++) {

core/src/main/java/com/boydti/fawe/object/extent/FastWorldEditExtent.java

@@ -82,6 +82,11 @@ public class FastWorldEditExtent extends AbstractDelegateExtent implements HasFa
         return null;
     }
 
+    @Override
+    public String toString() {
+        return super.toString() + ":" + queue + "(" + getExtent() + ")";
+    }
+
     @Override
     public BaseBiome getBiome(final Vector2D position) {
         return FaweCache.CACHE_BIOME[queue.getBiomeId(position.getBlockX(), position.getBlockZ())];

core/src/main/java/com/boydti/fawe/object/extent/NullExtent.java

@@ -58,6 +58,11 @@ public class NullExtent extends FaweRegionExtent {
         throw new FaweException(reason);
     }
 
+    @Override
+    public boolean setBlock(int x, int y, int z, BaseBlock block) throws WorldEditException {
+        throw new FaweException(reason);
+    }
+
     @Override
     public BaseBlock getLazyBlock(int x, int y, int z) {
         throw new FaweException(reason);

core/src/main/java/com/boydti/fawe/util/WEManager.java

@@ -25,7 +25,10 @@ public class WEManager {
         try {
             final Field field = AbstractDelegateExtent.class.getDeclaredField("extent");
             field.setAccessible(true);
-            field.set(parent, new NullExtent((Extent) field.get(parent), reason));
+            Object currentExtent = field.get(parent);
+            if (!(currentExtent instanceof NullExtent)) {
+                field.set(parent, new NullExtent((Extent) field.get(parent), reason));
+            }
         } catch (final Exception e) {
             MainUtil.handleError(e);
         }

core/src/main/java/com/sk89q/worldedit/EditSession.java

@@ -420,7 +420,8 @@ public class EditSession extends AbstractWorld implements HasFaweQueue, Lighting
         NullExtent nullExtent = new NullExtent(world, BBC.WORLDEDIT_CANCEL_REASON_MANUAL);
         while (traverser != null) {
             ExtentTraverser next = traverser.next();
-            if (traverser.get() instanceof AbstractDelegateExtent) {
+            Extent get = traverser.get();
+            if (get instanceof AbstractDelegateExtent && !(get instanceof NullExtent)) {
                 traverser.setNext(nullExtent);
             }
             traverser = next;
@@ -813,6 +814,11 @@ public class EditSession extends AbstractWorld implements HasFaweQueue, Lighting
         return new HashMap<>();
     }
 
+    @Override
+    public String toString() {
+        return super.toString() + ":" + extent.toString();
+    }
+
     /**
      * Get the number of blocks changed, including repeated block changes.
      *
@@ -863,6 +869,7 @@ public class EditSession extends AbstractWorld implements HasFaweQueue, Lighting
     @Override
     public BaseBlock getLazyBlock(final Vector position) {
         if (position.getY() > maxY || position.getY() < 0) {
+            if (!limit.MAX_FAILS()) throw new FaweException(BBC.WORLDEDIT_CANCEL_REASON_MAX_CHECKS);
             return nullBlock;
         }
         return getLazyBlock(position.getBlockX(), position.getBlockY(), position.getBlockZ());
@@ -879,6 +886,7 @@ public class EditSession extends AbstractWorld implements HasFaweQueue, Lighting
     @Override
     public BaseBlock getBlock(final Vector position) {
         if (position.getY() > maxY || position.getY() < 0) {
+            if (!limit.MAX_FAILS()) throw new FaweException(BBC.WORLDEDIT_CANCEL_REASON_MAX_CHECKS);
             return nullBlock;
         }
         return getLazyBlock(position.getBlockX(), position.getBlockY(), position.getBlockZ());
@@ -1167,8 +1175,8 @@ public class EditSession extends AbstractWorld implements HasFaweQueue, Lighting
      *
      * @param position the position
      * @param block the block
-     * @param probability a probability between 0 and 1, inclusive
      * @return whether a block was changed
+     * @param probability a probability between 0 and 1, inclusive
      * @throws MaxChangedBlocksException thrown if too many blocks are changed
      */
     public boolean setChanceBlockIfAir(final Vector position, final BaseBlock block, final double probability) throws MaxChangedBlocksException {

core/src/main/java/com/sk89q/worldedit/extent/AbstractDelegateExtent.java

@@ -181,6 +181,11 @@ public abstract class AbstractDelegateExtent implements LightingExtent {
         return null;
     }
 
+    @Override
+    public String toString() {
+        return super.toString() + ":" + extent.toString();
+    }
+
     @Override
     public final @Nullable Operation commit() {
         Operation ours = commitBefore();

core/src/main/java/com/sk89q/worldedit/function/operation/ForwardExtentCopy.java

@@ -252,11 +252,12 @@ public class ForwardExtentCopy implements Operation {
         List<? extends Entity> entities = source.getEntities(region);
 
         for (int i = 0; i < repetitions; i++) {
+            Operations.completeBlindly(blockVisitor);
+
             ExtentEntityCopy entityCopy = new ExtentEntityCopy(from, destination, to, currentTransform);
             entityCopy.setRemoving(removingEntities);
             EntityVisitor entityVisitor = new EntityVisitor(entities.iterator(), entityCopy);
 
-            Operations.completeBlindly(blockVisitor);
             Operations.completeBlindly(entityVisitor);
 
             if (transExt != null) {

core/src/main/java/com/sk89q/worldedit/function/visitor/RegionVisitor.java

@@ -24,6 +24,7 @@ import com.boydti.fawe.config.Settings;
 import com.boydti.fawe.example.MappedFaweQueue;
 import com.boydti.fawe.object.FaweQueue;
 import com.boydti.fawe.object.HasFaweQueue;
+import com.boydti.fawe.object.exception.FaweException;
 import com.sk89q.worldedit.BlockVector;
 import com.sk89q.worldedit.EditSession;
 import com.sk89q.worldedit.Vector;
@@ -159,12 +160,16 @@ public class RegionVisitor implements Operation {
                     apply(trailIter.next());
                     apply(trailIter.next());
                 }
+            } catch (FaweException e) {
+                throw new RuntimeException(e);
             } catch (Throwable ignore) {}
             try {
                 for (;;) {
                     apply(trailIter.next());
                     apply(trailIter.next());
                 }
+            } catch (FaweException e) {
+                throw new RuntimeException(e);
             } catch (Throwable ignore) {}
         } else {
             for (Vector pt : iterable) {