So it begins...

patches/server/0128-Cap-Entity-Collisions.patch

@@ -1,42 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Aikar <aikar@aikar.co>
-Date: Sun, 22 Jan 2017 18:07:56 -0500
-Subject: [PATCH] Cap Entity Collisions
-
-Limit a single entity to colliding a max of configurable times per tick.
-This will alleviate issues where living entities are hoarded in 1x1 pens
-
-This is not tied to the maxEntityCramming rule. Cramming will still apply
-just as it does in Vanilla, but entity pushing logic will be capped.
-
-You can set this to 0 to disable collisions.
-
-diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
-index 069fe5df02806103c9bbef396c2e39ca3be90101..ca46bea3799e1bc962debe742ea75f4d7f4ab771 100644
---- a/src/main/java/net/minecraft/world/entity/Entity.java
-+++ b/src/main/java/net/minecraft/world/entity/Entity.java
-@@ -387,6 +387,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource {
-     public void inactiveTick() { }
-     // Spigot end
-     // Paper start
-+    protected int numCollisions = 0; // Paper
-     @javax.annotation.Nullable
-     private org.bukkit.util.Vector origin;
-     @javax.annotation.Nullable
-diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
-index 01b9635e71a55f29e565fc095cc53f102945423d..0470329b43afd4e8c5e033666d1c5f8f0a03fe6a 100644
---- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
-+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
-@@ -3317,8 +3317,11 @@ public abstract class LivingEntity extends Entity implements Attackable {
-                     }
-                 }
- 
--                for (j = 0; j < list.size(); ++j) {
-+            this.numCollisions = Math.max(0, this.numCollisions - this.level().paperConfig().collisions.maxEntityCollisions); // Paper
-+            for (j = 0; j < list.size() && this.numCollisions < this.level().paperConfig().collisions.maxEntityCollisions; ++j) { // Paper
-                     Entity entity = (Entity) list.get(j);
-+                entity.numCollisions++; // Paper
-+                this.numCollisions++; // Paper
- 
-                     this.doPush(entity);
-                 }