From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Dreeam <61569423+Dreeam-qwq@users.noreply.github.com>
Date: Mon, 11 Sep 2023 15:47:19 -0400
Subject: [PATCH] Reduce canSee work

Credit by: Martijn Muijsers <martijnmuijsers@live.nl>, MachineBreaker<machinebreaker>

diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 2c5c84c028d1298bb145fa1149752db3f83d5de2..86d535c704d174da9b75bd599a7b302ba5fe5e56 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -386,17 +386,19 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
         for (int i = 0, len = entities.size(); i < len; ++i) {
             Entity entity = entities.get(i);
 
-            if (checkCanSee && source instanceof net.minecraft.server.level.ServerPlayer && entity instanceof net.minecraft.server.level.ServerPlayer
-                && !((net.minecraft.server.level.ServerPlayer) source).getBukkitEntity().canSee(((net.minecraft.server.level.ServerPlayer) entity).getBukkitEntity())) {
-                continue;
-            }
-
+            // Leaf - move up
             // !entity1.dead && entity1.i && (entity == null || !entity1.x(entity));
             // elide the last check since vanilla calls with entity = null
             // only we care about the source for the canSee check
             if (entity.isRemoved() || !entity.blocksBuilding) {
                 continue;
             }
+            // Leaf end
+
+            if (checkCanSee && source instanceof net.minecraft.server.level.ServerPlayer && entity instanceof net.minecraft.server.level.ServerPlayer
+                && !((net.minecraft.server.level.ServerPlayer) source).getBukkitEntity().canSee(((net.minecraft.server.level.ServerPlayer) entity).getBukkitEntity())) {
+                continue;
+            }
 
             if (net.minecraft.world.phys.shapes.Shapes.joinIsNotEmpty(voxelshape, net.minecraft.world.phys.shapes.Shapes.create(entity.getBoundingBox()), net.minecraft.world.phys.shapes.BooleanOp.AND)) {
                 return false;
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 7e13ffee8e650cd5fe63fddf636321830e6ffb6d..f0da7fb7b09c8a5483b5d741810ab99985df64b6 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -591,6 +591,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
             return false;
         }
         OfflinePlayer other = (OfflinePlayer) obj;
+        if (this == obj) return true; // Leaf - reduce canSee work
         if ((this.getUniqueId() == null) || (other.getUniqueId() == null)) {
             return false;
         }