From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 16 Feb 2021 00:16:56 -0800
Subject: [PATCH] Send full pos packets for hard colliding entities

Prevent collision problems due to desync (i.e boats)

Configurable under
`send-full-pos-for-hard-colliding-entities`

diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
index 22eec853588ded2d255ab69d408f8e987832abe2..4f103f731623a8570238a6867fda1c5f83fca4e4 100644
--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
@@ -183,7 +183,7 @@ public class ServerEntity {
                     long i1 = this.positionCodec.encodeZ(vec3d);
                     boolean flag6 = k < -32768L || k > 32767L || l < -32768L || l > 32767L || i1 < -32768L || i1 > 32767L;
 
-                    if (!flag6 && this.teleportDelay <= 400 && !this.wasRiding && this.wasOnGround == this.entity.onGround()) {
+                    if (!flag6 && this.teleportDelay <= 400 && !this.wasRiding && this.wasOnGround == this.entity.onGround()&& !(io.papermc.paper.configuration.GlobalConfiguration.get().collisions.sendFullPosForHardCollidingEntities && this.entity.hardCollides())) { // Paper - send full pos for hard colliding entities to prevent collision problems due to desync
                         if ((!flag2 || !flag3) && !(this.entity instanceof AbstractArrow)) {
                             if (flag2) {
                                 packet1 = new ClientboundMoveEntityPacket.Pos(this.entity.getId(), (short) ((int) k), (short) ((int) l), (short) ((int) i1), this.entity.onGround());
