From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Noah van der Aa <ndvdaa@gmail.com>
Date: Fri, 7 Jan 2022 11:58:26 +0100
Subject: [PATCH] Don't tick markers

Fixes https://github.com/PaperMC/Paper/issues/7276 by not adding markers to the entity
tick list at all and ignoring them in Spigot's activation range checks. The entity tick
list is only used in the tick and tickPassenger methods, so we can safely not add the
markers to it.

diff --git a/src/main/java/com/destroystokyo/paper/PaperCommand.java b/src/main/java/com/destroystokyo/paper/PaperCommand.java
index 5f079cf06b0d1505bfb3fda5c326b2d7fd4f0e48..febb35091d32735ae2fe846170bd2c46d1449723 100644
--- a/src/main/java/com/destroystokyo/paper/PaperCommand.java
+++ b/src/main/java/com/destroystokyo/paper/PaperCommand.java
@@ -629,7 +629,7 @@ public class PaperCommand extends Command {
                     ChunkPos chunk = e.chunkPosition();
                     info.left++;
                     info.right.put(chunk, info.right.getOrDefault(chunk, 0) + 1);
-                    if (!chunkProviderServer.isPositionTicking(e)) {
+                    if (!chunkProviderServer.isPositionTicking(e) || e instanceof net.minecraft.world.entity.Marker) { // Markers aren't ticked.
                         nonEntityTicking.merge(key, Integer.valueOf(1), Integer::sum);
                     }
                 });
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 852bd159f122826b8cc3f8c4e89f87eba399fffd..443ef9d81e769c26ebd5a7d72078ed0f43306a7e 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -2492,6 +2492,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
         }
 
         public void onTickingStart(Entity entity) {
+            if (entity instanceof net.minecraft.world.entity.Marker) return; // Paper - Don't tick markers
             ServerLevel.this.entityTickList.add(entity);
             ServerLevel.this.entityManager.addNavigatorsIfPathingToRegion(entity); // Paper - optimise notify
         }
diff --git a/src/main/java/org/spigotmc/ActivationRange.java b/src/main/java/org/spigotmc/ActivationRange.java
index 5bffc9a0f6ef9d54abb359565d07509b177c2b82..1a1a1f4d0ac025daccc2d3f84faf6592819f4d5c 100644
--- a/src/main/java/org/spigotmc/ActivationRange.java
+++ b/src/main/java/org/spigotmc/ActivationRange.java
@@ -211,7 +211,7 @@ public class ActivationRange
             // Paper end
 
             // Paper start
-            java.util.List<Entity> entities = world.getEntities((Entity)null, maxBB, null);
+            java.util.List<Entity> entities = world.getEntities((Entity)null, maxBB, (e) -> !(e instanceof net.minecraft.world.entity.Marker)); // Don't tick markers
             for (int i = 0; i < entities.size(); i++) {
                 Entity entity = entities.get(i);
                 ActivationRange.activateEntity(entity);