Paper/Spigot-Server-Patches/0399-MC-145656-Fix-Follow-Range-Initial-Target.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <Blake.Galbreath@GMail.com>
Date: Wed, 18 Dec 2019 22:21:35 -0600
Subject: [PATCH] MC-145656 Fix Follow Range Initial Target


diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index f8a617a62e62d088077712bfb66656c28b82a3c5..5c5a79d0ea00c9c4c2e93d524291f48f92e77857 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -582,4 +582,9 @@ public class PaperWorldConfig {
     private void pillagerSettings() {
         disablePillagerPatrols = getBoolean("game-mechanics.disable-pillager-patrols", disablePillagerPatrols);
     }
+
+    public boolean entitiesTargetWithFollowRange = false;
+    private void entitiesTargetWithFollowRange() {
+        entitiesTargetWithFollowRange = getBoolean("entities-target-with-follow-range", entitiesTargetWithFollowRange);
+    }
 }
diff --git a/src/main/java/net/minecraft/server/PathfinderGoalNearestAttackableTarget.java b/src/main/java/net/minecraft/server/PathfinderGoalNearestAttackableTarget.java
index 25a67f91e487d80d3996cc8b2544fece55059590..c0721c7fe479c8f753b8f48197a70dcd1ecfef5f 100644
--- a/src/main/java/net/minecraft/server/PathfinderGoalNearestAttackableTarget.java
+++ b/src/main/java/net/minecraft/server/PathfinderGoalNearestAttackableTarget.java
@@ -25,6 +25,7 @@ public class PathfinderGoalNearestAttackableTarget<T extends EntityLiving> exten
         this.b = i;
         this.a(EnumSet.of(PathfinderGoal.Type.TARGET));
         this.d = (new PathfinderTargetCondition()).a(this.k()).a(predicate);
+        if (entityinsentient.world.paperConfig.entitiesTargetWithFollowRange) this.d.useFollowRange(); // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/server/PathfinderTargetCondition.java b/src/main/java/net/minecraft/server/PathfinderTargetCondition.java
index 42859f323ad5a300e0026e86371f5753ab3feab5..af09e1926fb6f3b780a5063b2e2e00da4cdc8ce6 100644
--- a/src/main/java/net/minecraft/server/PathfinderTargetCondition.java
+++ b/src/main/java/net/minecraft/server/PathfinderTargetCondition.java
@@ -80,7 +80,7 @@ public class PathfinderTargetCondition {
 
                 if (this.b > 0.0D) {
                     double d0 = this.g ? entityliving1.A(entityliving) : 1.0D;
-                    double d1 = this.b * d0;
+                    double d1 = (useFollowRange ? getFollowRange(entityliving) : this.b) * d0; // Paper
                     double d2 = entityliving.g(entityliving1.locX(), entityliving1.locY(), entityliving1.locZ());
 
                     if (d2 > d1 * d1) {
@@ -96,4 +96,18 @@ public class PathfinderTargetCondition {
             return true;
         }
     }
+
+    // Paper start
+    private boolean useFollowRange = false;
+
+    public PathfinderTargetCondition useFollowRange() {
+        this.useFollowRange = true;
+        return this;
+    }
+
+    private double getFollowRange(EntityLiving entityliving) {
+        AttributeModifiable attributeinstance = entityliving.getAttributeInstance(GenericAttributes.FOLLOW_RANGE);
+        return attributeinstance == null ? 16.0D : attributeinstance.getValue();
+    }
+    // Paper end
 }