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/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 55cd070c2dbf4cf4d8d0fc62067e9bde69ac7e84..03dcaffb57436875baf1b1f85133f422f5b7bbe0 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2057,6 +2057,13 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
         switch (packet.getAction()) {
             case PRESS_SHIFT_KEY:
                 this.player.setShiftKeyDown(true);
+
+                // Paper start - Hang on!
+                if (this.player.level.paperConfig.parrotsHangOnBetter) {
+                    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 e8768625e55f849cd31784cb46e67293bcd93abf..73277b04a45444edce02cce3e033741ebaf2ad0c 100644
--- a/src/main/java/net/minecraft/world/entity/player/Player.java
+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
@@ -579,7 +579,7 @@ 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.parrotsHangOnBetter) this.removeEntitiesOnShoulder(); // Paper - Hang on!
         }
 
     }
@@ -1939,7 +1939,7 @@ public abstract class Player extends LivingEntity {
         }
     }
 
-    protected void removeEntitiesOnShoulder() {
+    public void removeEntitiesOnShoulder() { // Paper - protected -> public
         if (this.timeEntitySatOnShoulder + 20L < this.level.getGameTime()) {
             // CraftBukkit start
             if (this.spawnEntityFromShoulder(this.getShoulderEntityLeft())) {