SPIGOT-6719: Add getTileEntities() to LimitedRegion

By: DerFrZocker <derrieple@gmail.com>

paper-server/src/main/java/org/bukkit/craftbukkit/generator/CraftLimitedRegion.java

@@ -6,6 +6,7 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Random;
+import net.minecraft.core.BlockPosition;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.server.level.RegionLimitedWorldAccess;
 import net.minecraft.world.entity.EntityTypes;
@@ -119,6 +120,22 @@ public class CraftLimitedRegion extends CraftRegionAccessor implements LimitedRe
         return region.contains(x, y, z);
     }
 
+    @Override
+    public List<BlockState> getTileEntities() {
+        List<BlockState> blockStates = new ArrayList<>();
+
+        for (int x = -(buffer >> 4); x <= (buffer >> 4); x++) {
+            for (int z = -(buffer >> 4); z <= (buffer >> 4); z++) {
+                ProtoChunk chunk = (ProtoChunk) getHandle().getChunkAt(centerChunkX + x, centerChunkZ + z);
+                for (BlockPosition position : chunk.c()) { // PAIL rename getTilePositions
+                    blockStates.add(getBlockState(position.getX(), position.getY(), position.getZ()));
+                }
+            }
+        }
+
+        return blockStates;
+    }
+
     @Override
     public Biome getBiome(int x, int y, int z) {
         Preconditions.checkArgument(isInRegion(x, y, z), "Coordinates %s, %s, %s are not in the region", x, y, z);