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 bc930015082ad6b2c5d744f823d9ad28a07fa5d4..63f3743bbf3632badf4e66a5ee4239ccbc5df700 100644
--- a/src/main/java/net/minecraft/server/EntityHuman.java
+++ b/src/main/java/net/minecraft/server/EntityHuman.java
@@ -434,7 +434,7 @@ 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 a6de594acd00697d0ca55d2caea9cdbf505d6752..331282ed36989c3b29e2a0ad5c3704bd869d1893 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -1906,6 +1906,13 @@ 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);