Paper/patches/server/0424-Improve-fix-EntityTargetLivingEntityEvent.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Fri, 9 Dec 2022 03:10:23 -0800
Subject: [PATCH] Improve/fix EntityTargetLivingEntityEvent
diff --git a/src/main/java/net/minecraft/world/entity/ai/behavior/StopAttackingIfTargetInvalid.java b/src/main/java/net/minecraft/world/entity/ai/behavior/StopAttackingIfTargetInvalid.java
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index 5aeef564cdaabeed88a52635e56073cca3a9d1f1..fe635e46569c67dac1d3581ee930d1bfa8b4030e 100644
--- a/src/main/java/net/minecraft/world/entity/ai/behavior/StopAttackingIfTargetInvalid.java
+++ b/src/main/java/net/minecraft/world/entity/ai/behavior/StopAttackingIfTargetInvalid.java
@@ -47,17 +47,30 @@ public class StopAttackingIfTargetInvalid {
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if (entityinsentient.canAttack(entityliving) && (!shouldForgetIfTargetUnreachable || !StopAttackingIfTargetInvalid.isTiredOfTryingToReachTarget(entityinsentient, behaviorbuilder_b.tryGet(memoryaccessor1))) && entityliving.isAlive() && entityliving.level() == entityinsentient.level() && !alternativeCondition.test(entityliving)) {
return true;
} else {
+ // Paper start - better track target change reason
+ final EntityTargetEvent.TargetReason reason;
+ if (!entityinsentient.canAttack(entityliving)) {
+ reason = EntityTargetEvent.TargetReason.TARGET_INVALID;
+ } else if (shouldForgetIfTargetUnreachable && StopAttackingIfTargetInvalid.isTiredOfTryingToReachTarget(entityinsentient, behaviorbuilder_b.tryGet(memoryaccessor1))) {
+ reason = EntityTargetEvent.TargetReason.FORGOT_TARGET;
+ } else if (!entityliving.isAlive()) {
+ reason = EntityTargetEvent.TargetReason.TARGET_DIED;
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+ } else if (entityliving.level() != entityinsentient.level()) {
+ reason = EntityTargetEvent.TargetReason.TARGET_OTHER_LEVEL;
+ } else {
+ reason = EntityTargetEvent.TargetReason.TARGET_INVALID;
+ }
+ // Paper end
// CraftBukkit start
- LivingEntity old = entityinsentient.getBrain().getMemory(MemoryModuleType.ATTACK_TARGET).orElse(null);
- EntityTargetEvent event = CraftEventFactory.callEntityTargetLivingEvent(entityinsentient, null, (old != null && !old.isAlive()) ? EntityTargetEvent.TargetReason.TARGET_DIED : EntityTargetEvent.TargetReason.FORGOT_TARGET);
+ EntityTargetEvent event = CraftEventFactory.callEntityTargetLivingEvent(entityinsentient, null, reason); // Paper
if (event.isCancelled()) {
return false;
}
- if (event.getTarget() == null) {
- memoryaccessor.erase();
- return true;
- }
- entityliving = ((CraftLivingEntity) event.getTarget()).getHandle();
+ // if (event.getTarget() == null) { // Paper - this is wrong, you are skipping the forgetCallback
+ // memoryaccessor.erase();
+ // return true;
+ // }
+ // entityliving = ((CraftLivingEntity) event.getTarget()).getHandle();
// CraftBukkit end
forgetCallback.accept(entityinsentient, entityliving);
memoryaccessor.erase();