Paper/patches/server/0578-Add-dropLeash-variable-to-EntityUnleashEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Nassim Jahnke <jahnke.nassim@gmail.com>
Date: Fri, 29 Jan 2021 15:13:11 +0100
Subject: [PATCH] Add dropLeash variable to EntityUnleashEvent


diff --git a/src/main/java/net/minecraft/world/entity/Mob.java b/src/main/java/net/minecraft/world/entity/Mob.java
index 9e0f1938f534a61abc00ed80c8effd7d15056195..0582c118b6206406764d1ea83ca6289cbb0a1392 100644
--- a/src/main/java/net/minecraft/world/entity/Mob.java
+++ b/src/main/java/net/minecraft/world/entity/Mob.java
@@ -1242,12 +1242,15 @@ public abstract class Mob extends LivingEntity {
             return InteractionResult.PASS;
         } else if (this.getLeashHolder() == player) {
             // CraftBukkit start - fire PlayerUnleashEntityEvent
-            if (CraftEventFactory.callPlayerUnleashEntityEvent(this, player).isCancelled()) {
+            // Paper start - drop leash variable
+            org.bukkit.event.player.PlayerUnleashEntityEvent event = CraftEventFactory.callPlayerUnleashEntityEvent(this, player, !player.getAbilities().instabuild);
+            if (event.isCancelled()) {
+                // Paper end
                 ((ServerPlayer) player).connection.send(new ClientboundSetEntityLinkPacket(this, this.getLeashHolder()));
                 return InteractionResult.PASS;
             }
             // CraftBukkit end
-            this.dropLeash(true, !player.getAbilities().instabuild);
+            this.dropLeash(true, event.isDropLeash()); // Paper - drop leash variable
             return InteractionResult.sidedSuccess(this.level.isClientSide);
         } else {
             InteractionResult enuminteractionresult = this.checkAndHandleImportantInteractions(player, hand);
@@ -1410,8 +1413,11 @@ public abstract class Mob extends LivingEntity {
 
         if (this.leashHolder != null) {
             if (!this.isAlive() || !this.leashHolder.isAlive()) {
-                this.level.getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), (!this.isAlive()) ? UnleashReason.PLAYER_UNLEASH : UnleashReason.HOLDER_GONE)); // CraftBukkit
-                this.dropLeash(true, true);
+                // Paper start - drop leash variable
+                EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), (!this.isAlive()) ? UnleashReason.PLAYER_UNLEASH : UnleashReason.HOLDER_GONE, true);
+                this.level.getCraftServer().getPluginManager().callEvent(event); // CraftBukkit
+                this.dropLeash(true, event.isDropLeash());
+                // Paper end
             }
 
         }
@@ -1474,8 +1480,11 @@ public abstract class Mob extends LivingEntity {
         boolean flag1 = super.startRiding(entity, force);
 
         if (flag1 && this.isLeashed()) {
-            this.level.getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), UnleashReason.UNKNOWN)); // CraftBukkit
-            this.dropLeash(true, true);
+            // Paper start - drop leash variable
+            EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), UnleashReason.UNKNOWN, true);
+            this.level.getCraftServer().getPluginManager().callEvent(event); // CraftBukkit
+            this.dropLeash(true, event.isDropLeash());
+            // Paper end
         }
 
         return flag1;
@@ -1653,8 +1662,11 @@ public abstract class Mob extends LivingEntity {
     @Override
     protected void removeAfterChangingDimensions() {
         super.removeAfterChangingDimensions();
-        this.level.getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), UnleashReason.UNKNOWN)); // CraftBukkit
-        this.dropLeash(true, false);
+        // Paper start - drop leash variable
+        EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), UnleashReason.UNKNOWN, false);
+        this.level.getCraftServer().getPluginManager().callEvent(event); // CraftBukkit
+        this.dropLeash(true, event.isDropLeash());
+        // Paper end
         this.getAllSlots().forEach((itemstack) -> {
             if (!itemstack.isEmpty()) itemstack.setCount(0); // CraftBukkit
         });
diff --git a/src/main/java/net/minecraft/world/entity/PathfinderMob.java b/src/main/java/net/minecraft/world/entity/PathfinderMob.java
index 9f2e5cd76376f0f15ed7d93018af2f605eb12e15..41fa86e009a6bc2faf32a211639e8bc6a40bb00c 100644
--- a/src/main/java/net/minecraft/world/entity/PathfinderMob.java
+++ b/src/main/java/net/minecraft/world/entity/PathfinderMob.java
@@ -49,8 +49,11 @@ public abstract class PathfinderMob extends Mob {
 
             if (this instanceof TamableAnimal && ((TamableAnimal) this).isInSittingPose()) {
                 if (f > entity.level.paperConfig.maxLeashDistance) { // Paper
-                    this.level.getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE)); // CraftBukkit
-                    this.dropLeash(true, true);
+                    // Paper start - drop leash variable
+                    EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE, true);
+                    this.level.getCraftServer().getPluginManager().callEvent(event); // CraftBukkit
+                    this.dropLeash(true, event.isDropLeash());
+                    // Paper end
                 }
 
                 return;
@@ -58,8 +61,11 @@ public abstract class PathfinderMob extends Mob {
 
             this.onLeashDistance(f);
             if (f > entity.level.paperConfig.maxLeashDistance) { // Paper
-                this.level.getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE)); // CraftBukkit
-                this.dropLeash(true, true);
+                // Paper start - drop leash variable
+                EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE, true);
+                this.level.getCraftServer().getPluginManager().callEvent(event); // CraftBukkit
+                this.dropLeash(true, event.isDropLeash());
+                // Paper end
                 this.goalSelector.disableControlFlag(Goal.Flag.MOVE);
             } else if (f > 6.0F) {
                 double d0 = (entity.getX() - this.getX()) / (double) f;
diff --git a/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java b/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java
index 7eb315aac7737cf443c693147c2cfd871f201724..03de59302041b0bc13922ec129501417804df915 100644
--- a/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java
+++ b/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java
@@ -122,11 +122,14 @@ public class LeashFenceKnotEntity extends HangingEntity {
                         entityinsentient = (Mob) iterator.next();
                         if (entityinsentient.isLeashed() && entityinsentient.getLeashHolder() == this) {
                             // CraftBukkit start
-                            if (CraftEventFactory.callPlayerUnleashEntityEvent(entityinsentient, player).isCancelled()) {
+                            // Paper start - drop leash variable
+                            org.bukkit.event.player.PlayerUnleashEntityEvent event = CraftEventFactory.callPlayerUnleashEntityEvent(entityinsentient, player, !player.getAbilities().instabuild);
+                            if (event.isCancelled()) {
+                                // Paper end
                                 die = false;
                                 continue;
                             }
-                            entityinsentient.dropLeash(true, !player.getAbilities().instabuild); // false -> survival mode boolean
+                            entityinsentient.dropLeash(true, event.isDropLeash()); // false -> survival mode boolean // Paper - drop leash variable
                             // CraftBukkit end
                         }
                     }
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 30bf86f0f22b783273286b4372541f8a2def0eb2..dbe2d218aa2561b404519245d3ef09b9a1e234e3 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1524,8 +1524,10 @@ public class CraftEventFactory {
         return itemInHand;
     }
 
-    public static PlayerUnleashEntityEvent callPlayerUnleashEntityEvent(Mob entity, net.minecraft.world.entity.player.Player player) {
-        PlayerUnleashEntityEvent event = new PlayerUnleashEntityEvent(entity.getBukkitEntity(), (Player) player.getBukkitEntity());
+    // Paper start - drop leash variable
+    public static PlayerUnleashEntityEvent callPlayerUnleashEntityEvent(Mob entity, net.minecraft.world.entity.player.Player player, boolean dropLeash) {
+        PlayerUnleashEntityEvent event = new PlayerUnleashEntityEvent(entity.getBukkitEntity(), (Player) player.getBukkitEntity(), dropLeash);
+        // Paper end
         entity.level.getCraftServer().getPluginManager().callEvent(event);
         return event;
     }