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?

diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index c611b5a63498f5ad1f50a75ccd5d7299e27df7e3..9d1cddc6038f0fd0286e4a32013ae98ff0b00dd1 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -330,4 +330,10 @@ 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 10c388acaad0cfd6bfffd955a83b29065d591719..f17bd192dc26878ec0979b6812477a96a7f02607 100644
--- a/src/main/java/net/minecraft/server/EntityHuman.java
+++ b/src/main/java/net/minecraft/server/EntityHuman.java
@@ -436,7 +436,7 @@ 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.abilities.isFlying || this.isSleeping()) {
-            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 bb99e1ed16deba5b39323c5a65bf68986ff816fe..e83f1bfe2b2c33b3bc6788de6998356430857855 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -1903,6 +1903,13 @@ public class PlayerConnection implements PacketListenerPlayIn {
         switch (packetplayinentityaction.c()) {
             case PRESS_SHIFT_KEY:
                 this.player.setSneaking(true);
+
+            // Paper start - Hang on!
+            if (this.player.world.paperConfig.parrotsHangOnBetter) {
+                this.player.releaseShoulderEntities();
+            }
+            // Paper end
+
                 break;
             case RELEASE_SHIFT_KEY:
                 this.player.setSneaking(false);