From 0000000000000000000000000000000000000000 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?

== AT ==
public net.minecraft.world.entity.player.Player removeEntitiesOnShoulder()V

diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 1c31e887a23398c2717426209a8625bdd0e1a807..2e1f0ac59da4ce1f66a4e720c275744a28191478 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2322,6 +2322,13 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
         switch (packet.getAction()) {
             case PRESS_SHIFT_KEY:
                 this.player.setShiftKeyDown(true);
+
+                // Paper start - Hang on!
+                if (this.player.level.paperConfig().entities.behavior.parrotsAreUnaffectedByPlayerMovement) {
+                    this.player.removeEntitiesOnShoulder();
+                }
+                // Paper end
+
                 break;
             case RELEASE_SHIFT_KEY:
                 this.player.setShiftKeyDown(false);
diff --git a/src/main/java/net/minecraft/world/entity/player/Player.java b/src/main/java/net/minecraft/world/entity/player/Player.java
index aafc1b05b86d9b715cfe5ddbf4abd76a4ad772c3..11f1d8cc6f31b5a38db76ce411209a494c9e7e8a 100644
--- a/src/main/java/net/minecraft/world/entity/player/Player.java
+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
@@ -587,7 +587,7 @@ public abstract class Player extends LivingEntity {
         this.playShoulderEntityAmbientSound(this.getShoulderEntityLeft());
         this.playShoulderEntityAmbientSound(this.getShoulderEntityRight());
         if (!this.level.isClientSide && (this.fallDistance > 0.5F || this.isInWater()) || this.abilities.flying || this.isSleeping() || this.isInPowderSnow) {
-            this.removeEntitiesOnShoulder();
+            if (!this.level.paperConfig().entities.behavior.parrotsAreUnaffectedByPlayerMovement) this.removeEntitiesOnShoulder(); // Paper - Hang on!
         }
 
     }