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From 93ba4596484722bd10c1bc3d91bc25698415794d Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Tue, 16 May 2017 21:29:08 -0500
Subject: [PATCH] Add option to make parrots stay on shoulders despite movement

Makes parrots not fall off whenever the player changes height, or touches water, or gets hit by a passing leaf.
Instead, switches the behavior so that players have to sneak to make the birds leave.

I suspect Mojang may switch to this behavior before full release.

To be converted into a Paper-API event at some point in the future?

diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 02d99aec43..3507997fc3 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -361,4 +361,10 @@ public class PaperWorldConfig {
         maxCollisionsPerEntity = getInt( "max-entity-collisions", this.spigotConfig.getInt("max-entity-collisions", 8) );
         log( "Max Entity Collisions: " + maxCollisionsPerEntity );
     }
+
+    public boolean parrotsHangOnBetter;
+    private void parrotsHangOnBetter() {
+        parrotsHangOnBetter = getBoolean("parrots-are-unaffected-by-player-movement", false);
+        log("Parrots are unaffected by player movement: " + parrotsHangOnBetter);
+    }
 }
diff --git a/src/main/java/net/minecraft/server/EntityHuman.java b/src/main/java/net/minecraft/server/EntityHuman.java
index 09d2cd5716..b7a55b4d64 100644
--- a/src/main/java/net/minecraft/server/EntityHuman.java
+++ b/src/main/java/net/minecraft/server/EntityHuman.java
@@ -469,7 +469,7 @@ public abstract class EntityHuman extends EntityLiving {
         this.j(this.getShoulderEntityLeft());
         this.j(this.getShoulderEntityRight());
         if (!this.world.isClientSide && (this.fallDistance > 0.5F || this.isInWater() || this.isPassenger()) || this.abilities.isFlying) {
-            this.releaseShoulderEntities();
+            if (!this.world.paperConfig.parrotsHangOnBetter) this.releaseShoulderEntities(); // Paper - Hang on!
         }
 
     }
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 7ed26f6bf0..3289ba3ffd 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -1762,6 +1762,13 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
         switch (packetplayinentityaction.c()) {
         case START_SNEAKING:
             this.player.setSneaking(true);
+
+            // Paper start - Hang on!
+            if (this.player.world.paperConfig.parrotsHangOnBetter) {
+                this.player.releaseShoulderEntities();
+            }
+            // Paper end
+
             break;
 
         case STOP_SNEAKING:
-- 
2.19.1