Fix scanForLegacyEnderDragon world config (#11262)

patches/server/Add-config-to-disable-ender-dragon-legacy-check.patch

@@ -9,13 +9,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java
 +++ b/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java
 @@ -0,0 +0,0 @@ public class EndDragonFight {
-         this.ticksSinceLastPlayerScan = 21;
+         if (data.isRespawning) {
-         this.skipArenaLoadedCheck = false;
+             this.respawnStage = DragonRespawnAnimation.START;
-         this.needsStateScanning = true;
+         }
 +        // Paper start - Add config to disable ender dragon legacy check
-+        this.needsStateScanning = world.paperConfig().entities.spawning.scanForLegacyEnderDragon;
++        if (data == EndDragonFight.Data.DEFAULT && !world.paperConfig().entities.spawning.scanForLegacyEnderDragon) {
-+        if (!this.needsStateScanning) this.dragonKilled = true;
++            this.needsStateScanning = false;
++            this.dragonKilled = true;
++        }
 +        // Paper end - Add config to disable ender dragon legacy check
-         this.level = world;
+ 
-         this.origin = origin;
+         this.portalLocation = (BlockPos) data.exitPortalLocation.orElse(null); // CraftBukkit - decompile error
-         this.validPlayer = EntitySelector.ENTITY_STILL_ALIVE.and(EntitySelector.withinDistance((double) origin.getX(), (double) (128 + origin.getY()), (double) origin.getZ(), 192.0D));
+         this.gateways.addAll((Collection) data.gateways.orElseGet(() -> {