From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: MrHua269 <mrhua269@gmail.com>
Date: Mon, 4 May 2026 13:44:05 +0800
Subject: [PATCH] Leaf Better checking for useless move packets

A part of leaf(https://github.com/Winds-Studio/Leaf/blob/b794fca6080c47ff305b6d065a579171b1fe1e98/leaf-server/minecraft-patches/features/0018-Better-checking-for-useless-move-packets.patch)

Original license: https://github.com/Winds-Studio/Leaf/blob/b794fca6080c47ff305b6d065a579171b1fe1e98/LICENSE.md

diff --git a/net/minecraft/server/level/ServerEntity.java b/net/minecraft/server/level/ServerEntity.java
index 60af82925d2f7e605bf7340cf01f1a5668f4d725..2e71a1cbabf3405e3e4fd5349a1784d895e7e60c 100644
--- a/net/minecraft/server/level/ServerEntity.java
+++ b/net/minecraft/server/level/ServerEntity.java
@@ -186,18 +186,35 @@ public class ServerEntity {
                     packet = ClientboundEntityPositionSyncPacket.of(this.entity);
                     sentPosition = true;
                     sentRotation = true;
-                } else if ((!pos || !shouldSendRotation) && !(this.entity instanceof AbstractArrow)) {
+                /*} else if ((!pos || !shouldSendRotation) && !(this.entity instanceof AbstractArrow)) { // Gale - Airplane - better checking for useless move packets
                     if (pos) {
                         packet = new ClientboundMoveEntityPacket.Pos(this.entity.getId(), (short)xa, (short)ya, (short)za, this.entity.onGround());
                         sentPosition = true;
                     } else if (shouldSendRotation) {
                         packet = new ClientboundMoveEntityPacket.Rot(this.entity.getId(), yRotn, xRotn, this.entity.onGround());
                         sentRotation = true;
-                    }
+                    }*/ // Gale - Airplane - better checking for useless move packets
                 } else {
-                    packet = new ClientboundMoveEntityPacket.PosRot(this.entity.getId(), (short)xa, (short)ya, (short)za, yRotn, xRotn, this.entity.onGround());
+                    /*packet = new ClientboundMoveEntityPacket.PosRot(this.entity.getId(), (short)xa, (short)ya, (short)za, yRotn, xRotn, this.entity.onGround()); // Gale - Airplane - better checking for useless move packets
                     sentPosition = true;
-                    sentRotation = true;
+                    sentRotation = true;*/ // Gale - Airplane - better checking for useless move packets
+                    // Gale start - Airplane - better checking for useless move packets
+                    if (pos || shouldSendRotation || this.entity instanceof AbstractArrow) {
+                        if ((!pos || !shouldSendRotation) && !(this.entity instanceof AbstractArrow)) {
+                            if (pos) {
+                                packet = new ClientboundMoveEntityPacket.Pos(this.entity.getId(), (short) xa, (short) ya, (short) za, this.entity.onGround());
+                                sentPosition = true;
+                            } else if (shouldSendRotation) {
+                                packet = new ClientboundMoveEntityPacket.Rot(this.entity.getId(), yRotn, xRotn, this.entity.onGround());
+                                sentRotation = true;
+                            }
+                        } else {
+                            packet = new ClientboundMoveEntityPacket.PosRot(this.entity.getId(), (short) xa, (short) ya, (short) za, yRotn, xRotn, this.entity.onGround());
+                            sentPosition = true;
+                            sentRotation = true;
+                        }
+                    }
+                    // Gale end - Airplane - better checking for useless move packets
                 }
 
                 if (this.entity.needsSync || this.trackDelta || this.entity instanceof LivingEntity livingEntity && livingEntity.isFallFlying()) {