Correctly handle cross world entity teleportation

Spigot patch: 0124-Cross-World-Entity-Teleportation.patch

build.gradle

@@ -47,7 +47,7 @@ archivesBaseName = 'kcauldron'
 ext.mcVersion = "1.7.10"
 ext.cauldronVersion = "3"
 ext.forgeVersion = "1403"
-ext.revision = "59"
+ext.revision = "60"
 version = "${mcVersion}-${cauldronVersion}.${forgeVersion}.${revision}"
 
 launch4j {

patches/org/bukkit/event/player/PlayerTeleportEvent.java.patch

@@ -1,6 +1,6 @@
 --- ../src-base/minecraft/org/bukkit/event/player/PlayerTeleportEvent.java
 +++ ../src-work/minecraft/org/bukkit/event/player/PlayerTeleportEvent.java
-@@ -55,7 +55,14 @@
+@@ -55,11 +55,27 @@
           * portal
           */
          END_PORTAL,
@@ -15,3 +15,16 @@
           * Indicates the teleportation was caused by an event not covered by
           * this enum
           */
+         UNKNOWN;
++        
++        public boolean isPortal() {
++        	switch(this) {
++        	case NETHER_PORTAL:
++        	case END_PORTAL:
++        		return true;
++        	}
++        	return false;
++        }
+     }
+ 
+     @Override

src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java

@@ -413,7 +413,13 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
             return false;
         }
 
-        entity.worldObj = ((CraftWorld) location.getWorld()).getHandle();
+        // Spigot start
+        net.minecraft.world.WorldServer newWorld = ((CraftWorld) location.getWorld()).getHandle();
+        if (newWorld != entity.worldObj) {
+        	entity.teleportTo(location, cause.isPortal());
+            return true;
+        }
+        // Spigot
         entity.setPositionAndRotation(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
         // entity.setLocation() throws no event, and so cannot be cancelled
         return true;