Target default world when returning from The End; Fixes BUKKIT-3494

Due to the having to generate new logic to avoid using the customized
PlayerConnection.moveToWorld, entities returning from The End were not
properly calculating their exit target.  This commit corrects that
logic.

src/main/java/net/minecraft/server/Entity.java

@@ -1762,9 +1762,11 @@ public abstract class Entity {
 
             Location enter = this.getBukkitEntity().getLocation();
             Location exit = exitWorld != null ? minecraftserver.getPlayerList().calculateTarget(enter, minecraftserver.getWorldServer(i)) : null;
+            boolean useTravelAgent = exitWorld != null && !(this.dimension == 1 && exitWorld.dimension == 1); // don't use agent for custom worlds or return from THE_END
 
             TravelAgent agent = exit != null ? (TravelAgent) ((CraftWorld) exit.getWorld()).getHandle().s() : null;
             EntityPortalEvent event = new EntityPortalEvent(this.getBukkitEntity(), enter, exit, agent);
+            event.useTravelAgent(useTravelAgent);
             event.getEntity().getServer().getPluginManager().callEvent(event);
             if (event.isCancelled() || event.getTo() == null || !this.isAlive()) {
                 return;

src/main/java/net/minecraft/server/PlayerList.java

@@ -436,18 +436,22 @@ public abstract class PlayerList {
 
         Location enter = entityplayer.getBukkitEntity().getLocation();
         Location exit = null;
+        boolean useTravelAgent = false; // don't use agent for custom worlds or return from THE_END
         if (exitWorld != null) {
             if ((cause == TeleportCause.END_PORTAL) && (i == 0)) {
-                // THE_END -> NORMAL; use bed if available
+                // THE_END -> NORMAL; use bed if available, otherwise default spawn
                 exit = ((CraftPlayer) entityplayer.getBukkitEntity()).getBedSpawnLocation();
-            }
+                if (exit == null) exit = exitWorld.getWorld().getSpawnLocation();
-            if (exit == null) {
+            } else {
+                // NORMAL <-> NETHER or NORMAL -> THE_END
                 exit = this.calculateTarget(enter, exitWorld);
+                useTravelAgent = true;
             }
         }
 
         TravelAgent agent = exit != null ? (TravelAgent) ((CraftWorld) exit.getWorld()).getHandle().s() : null;
         PlayerPortalEvent event = new PlayerPortalEvent(entityplayer.getBukkitEntity(), enter, exit, agent, cause);
+        event.useTravelAgent(useTravelAgent);
         Bukkit.getServer().getPluginManager().callEvent(event);
         if (event.isCancelled() || event.getTo() == null) {
             return;
@@ -517,6 +521,8 @@ public abstract class PlayerList {
             ChunkCoordinates chunkcoordinates;
 
             if (i == 1) {
+                // use default NORMAL world spawn instead of target
+                worldserver1 = this.server.worlds.get(0);
                 chunkcoordinates = worldserver1.getSpawn();
             } else {
                 chunkcoordinates = worldserver1.getDimensionSpawn();
@@ -553,7 +559,7 @@ public abstract class PlayerList {
         }
 
         // entity.spawnIn(worldserver1);
-        return new Location(target.getWorld(), d0, y, d1, yaw, pitch);
+        return new Location(worldserver1.getWorld(), d0, y, d1, yaw, pitch);
     }
 
     // copy of original a(Entity, int, WorldServer, WorldServer) method with only entity repositioning logic

src/main/java/net/minecraft/server/PortalTravelAgent.java

@@ -185,9 +185,9 @@ public class PortalTravelAgent {
             // entity.setPositionRotation((double) i, (double) j, (double) k, entity.yaw, 0.0F);
             // entity.motX = entity.motY = entity.motZ = 0.0D;
             position.setPitch(0.0F);
-            position.setX(0);
+            velocity.setX(0);
-            position.setY(0);
+            velocity.setY(0);
-            position.setZ(0);
+            velocity.setZ(0);
         } else {
             double d4;
             int k1;