fix: upstream missing Region#getBoundingBox() (#1908)

Use block change limit for //copy and //cut

(cherry picked from commit fd8dbdd7b7b8b561db98a45b4eae3810dedb1551)

worldedit-core/src/main/java/com/sk89q/worldedit/command/ClipboardCommands.java

@@ -38,6 +38,7 @@ import com.google.common.collect.Lists;
 import com.sk89q.worldedit.EditSession;
 import com.sk89q.worldedit.LocalConfiguration;
 import com.sk89q.worldedit.LocalSession;
+import com.sk89q.worldedit.MaxChangedBlocksException;
 import com.sk89q.worldedit.WorldEdit;
 import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.command.util.CommandPermissions;
@@ -105,6 +106,20 @@ import static com.sk89q.worldedit.command.util.Logging.LogMode.REGION;
 @CommandContainer(superTypes = CommandPermissionsConditionGenerator.Registration.class)
 public class ClipboardCommands {
 
+    /**
+     * Throws if the region would allocate a clipboard larger than the block change limit.
+     *
+     * @param region The region to check
+     * @param session The session
+     * @throws MaxChangedBlocksException if the volume exceeds the limit
+     */
+    private void checkRegionBounds(Region region, LocalSession session) throws MaxChangedBlocksException {
+        int limit = session.getBlockChangeLimit();
+        if (region.getBoundingBox().getVolume() > limit) {
+            throw new MaxChangedBlocksException(limit);
+        }
+    }
+
     @Command(
             name = "/copy",
             aliases = "/cp",

worldedit-core/src/main/java/com/sk89q/worldedit/regions/CuboidRegion.java

@@ -256,6 +256,11 @@ public class CuboidRegion extends AbstractRegion implements FlatRegion {
         return pos1.getMaximum(pos2);
     }
 
+    @Override
+    public CuboidRegion getBoundingBox() {
+        return this;
+    }
+
     @Override
     public int getMinimumY() {
         return minY;

worldedit-core/src/main/java/com/sk89q/worldedit/regions/Region.java

@@ -72,6 +72,15 @@ public interface Region extends Iterable<BlockVector3>, Cloneable, IBatchProcess
     }
     //FAWE end
 
+    /**
+     * Get the bounding box of this region as a {@link CuboidRegion}.
+     *
+     * @return the bounding box
+     */
+    default CuboidRegion getBoundingBox() {
+        return new CuboidRegion(getMinimumPoint(), getMaximumPoint());
+    }
+
     /**
      * Get the center point of a region.
      * Note: Coordinates will not be integers