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 ff05efe0b78defe3d25905b6a2984bdb646fcff3..4c40245756cfbe4ba14069c58d615cea7e2fbf38 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -392,17 +392,19 @@ 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 6fe50b6dcda8d5356fccc7f3d9e30f21e3c1bef3..ad282ad487912c5687916b93be605b21a1ff8f15 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -555,6 +555,7 @@ 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;
         }