Paper/patches/server/0751-Mitigate-effects-of-WorldCreator-keepSpawnLoaded-ret.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Mon, 19 Sep 2022 00:13:02 +0100
Subject: [PATCH] Mitigate effects of WorldCreator#keepSpawnLoaded ret type
 change

TODO: Remove in 1.21?

diff --git a/src/main/java/org/bukkit/craftbukkit/util/Commodore.java b/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
index 0d5ce79dc8fb3b1677e09d663608a5cb5224de2f..3b71aa01d98f0f8d76fbb36986f74c9a6768855b 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
@@ -389,6 +389,12 @@ public class Commodore {
                             super.visitMethodInsn(Opcodes.INVOKEVIRTUAL, runtimeCbPkgPrefix() + "advancement/CraftAdvancement", "getDisplay0", desc, false);
                             return;
                         }
+                        if (owner.equals("org/bukkit/WorldCreator") && name.equals("keepSpawnLoaded") && desc.equals("(Lnet/kyori/adventure/util/TriState;)V")) {
+                            super.visitMethodInsn(opcode, owner, name, "(Lnet/kyori/adventure/util/TriState;)Lorg/bukkit/WorldCreator;", itf);
+                            // new method has a return, so, make sure we pop it
+                            super.visitInsn(Opcodes.POP);
+                            return;
+                        }
                         // Paper end
 
                         // Paper start - ItemFactory#getSpawnEgg (paper had original method that returned ItemStack, upstream added identical but returned Material)