Leaf/leaf-server/minecraft-patches/features/0018-Better-checking-for-useless-move-packets.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martijn Muijsers <martijnmuijsers@live.nl>
Date: Wed, 23 Nov 2022 22:26:37 +0100
Subject: [PATCH] Better checking for useless move packets

License: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)
Gale - https://galemc.org

This patch is based on the following patch:
"Better checking for useless move packets"
By: Paul Sauve <paul@technove.co>
As part of: Airplane (https://github.com/TECHNOVE/Airplane)
Licensed under: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)

* Airplane copyright *

Airplane
Copyright (C) 2020 Technove LLC

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

diff --git a/net/minecraft/server/level/ServerEntity.java b/net/minecraft/server/level/ServerEntity.java
index b118e91f1e0b5a8b8c0b2a4a32faabc5a34a5954..0db57c334bef3b6473ae1b734f953e150862eab5 100644
--- a/net/minecraft/server/level/ServerEntity.java
+++ b/net/minecraft/server/level/ServerEntity.java
@@ -189,19 +189,25 @@ public class ServerEntity {
                     packet = ClientboundEntityPositionSyncPacket.of(this.entity);
                     flag3 = true;
                     flag4 = true;
-                } else if ((!flag2 || !flag) && !(this.entity instanceof AbstractArrow)) {
-                    if (flag2) {
-                        packet = new ClientboundMoveEntityPacket.Pos(this.entity.getId(), (short)l, (short)l1, (short)l2, this.entity.onGround());
-                        flag3 = true;
-                    } else if (flag) {
-                        packet = new ClientboundMoveEntityPacket.Rot(this.entity.getId(), b, b1, this.entity.onGround());
-                        flag4 = true;
-                    }
+                // Gale start - Airplane - better checking for useless move packets
                 } else {
-                    packet = new ClientboundMoveEntityPacket.PosRot(this.entity.getId(), (short)l, (short)l1, (short)l2, b, b1, this.entity.onGround());
-                    flag3 = true;
-                    flag4 = true;
+                    if (flag2 || flag || this.entity instanceof AbstractArrow) {
+                        if ((!flag2 || !flag) && !(this.entity instanceof AbstractArrow)) {
+                            if (flag2) {
+                                packet = new ClientboundMoveEntityPacket.Pos(this.entity.getId(), (short) l, (short) l1, (short) l2, this.entity.onGround());
+                                flag3 = true;
+                            } else if (flag) {
+                                packet = new ClientboundMoveEntityPacket.Rot(this.entity.getId(), b, b1, this.entity.onGround());
+                                flag4 = true;
+                            }
+                        } else {
+                            packet = new ClientboundMoveEntityPacket.PosRot(this.entity.getId(), (short) l, (short) l1, (short) l2, b, b1, this.entity.onGround());
+                            flag3 = true;
+                            flag4 = true;
+                        }
+                    }
                 }
+                // Gale end - Airplane - better checking for useless move packets
 
                 if (this.entity.hasImpulse || this.trackDelta || this.entity instanceof LivingEntity && ((LivingEntity)this.entity).isFallFlying()) {
                     Vec3 deltaMovement = this.entity.getDeltaMovement();