Minor EditSession changes

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

@@ -19,12 +19,6 @@
 
 package com.sk89q.worldedit;
 
-import static com.google.common.base.Preconditions.checkArgument;
-import static com.google.common.base.Preconditions.checkNotNull;
-import static com.sk89q.worldedit.regions.Regions.asFlatRegion;
-import static com.sk89q.worldedit.regions.Regions.maximumBlockY;
-import static com.sk89q.worldedit.regions.Regions.minimumBlockY;
-
 import com.boydti.fawe.FaweCache;
 import com.boydti.fawe.config.Caption;
 import com.boydti.fawe.config.Settings;
@@ -130,7 +124,10 @@ import com.sk89q.worldedit.world.block.BlockStateHolder;
 import com.sk89q.worldedit.world.block.BlockType;
 import com.sk89q.worldedit.world.block.BlockTypes;
 import com.sk89q.worldedit.world.registry.LegacyMapper;
-import java.io.IOException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.jetbrains.annotations.Nullable;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -139,11 +136,15 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.io.IOException;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 import org.jetbrains.annotations.Range;
-import org.slf4j.Logger;
+
-import org.slf4j.LoggerFactory;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.sk89q.worldedit.regions.Regions.asFlatRegion;
+import static com.sk89q.worldedit.regions.Regions.maximumBlockY;
+import static com.sk89q.worldedit.regions.Regions.minimumBlockY;
 
 /**
  * An {@link Extent} that handles history, {@link BlockBag}s, change limits,
@@ -1446,6 +1447,17 @@ public class EditSession extends PassthroughExtent implements AutoCloseable {
         return this.changes = copy.getAffected();
     }
 
+    /**
+     * Move the blocks in a region a certain direction.
+     *
+     * @param region the region to move
+     * @param dir the direction
+     * @param distance the distance to move
+     * @param copyAir true to copy air blocks
+     * @param replacement the replacement pattern to fill in after moving, or null to use air
+     * @return number of blocks moved
+     * @throws MaxChangedBlocksException thrown if too many blocks are changed
+     */
     public int moveRegion(Region region, BlockVector3 dir, int distance, boolean copyAir,
                           boolean moveEntities, boolean copyBiomes, Pattern replacement) throws MaxChangedBlocksException {
         Mask mask = null;
@@ -1601,7 +1613,7 @@ public class EditSession extends PassthroughExtent implements AutoCloseable {
         MaskIntersection blockMask = new MaskUnion(liquidMask, Masks.negate(new ExistingBlockMask(this)));
 
         // There are boundaries that the routine needs to stay in
-        Mask mask = new MaskIntersection(
+        MaskIntersection mask = new MaskIntersection(
                 new BoundedHeightMask(0, Math.min(origin.getBlockY(), getWorld().getMaxY())),
                 new RegionMask(new EllipsoidRegion(null, origin, Vector3.at(radius, radius, radius))),
                 blockMask