When blocks adjacent to multiblock-capable blocks are updated, (#4474)

do not always recalculate existing multiblocks. Only do so,
if the adjacent block is either part of the multiblock's bounding
box, or if the adjacent block would be a valid part of the multiblock.

src/main/java/appeng/me/cluster/IAECluster.java

@@ -20,10 +20,23 @@ package appeng.me.cluster;
 
 import java.util.Iterator;
 
+import net.minecraft.util.math.AxisAlignedBB;
+import net.minecraft.util.math.BlockPos;
+
 import appeng.api.networking.IGridHost;
 
 public interface IAECluster {
 
+    /**
+     * The minimum x,y,z position still within the bounds of the cluster.
+     */
+    BlockPos getBoundsMin();
+
+    /**
+     * The maximum x,y,z position still within the bounds of the cluster.
+     */
+    BlockPos getBoundsMax();
+
     void updateStatus(boolean updateGrid);
 
     void destroy();