From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: JRoy <joshroy126@gmail.com>
Date: Wed, 15 Jul 2020 21:42:52 -0400
Subject: [PATCH] Fix SPIGOT-5989

Before this fix, if a player was respawning to a respawn anchor and
the respawn location was modified away from the anchor with the
PlayerRespawnEvent, the anchor would still lose some charge.
This fixes that by checking if the modified spawn location is
still at a respawn anchor.

diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index b33e610fee244e4791f6a88e8699c999913cb2d3..1b78f53d09cc26fe881933df8aa1a7e77337acf1 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -83,6 +83,7 @@ import net.minecraft.world.level.EnumGamemode;
 import net.minecraft.world.level.GameRules;
 import net.minecraft.world.level.World;
 import net.minecraft.world.level.biome.BiomeManager;
+import net.minecraft.world.level.block.BlockRespawnAnchor;
 import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.state.IBlockData;
 import net.minecraft.world.level.border.IWorldBorderListener;
@@ -850,6 +851,7 @@ public abstract class PlayerList {
         // Paper start
         boolean isBedSpawn = false;
         boolean isRespawn = false;
+        boolean isLocAltered = false; // Paper - Fix SPIGOT-5989
         // Paper end
 
         // CraftBukkit start - fire PlayerRespawnEvent
@@ -860,7 +862,7 @@ public abstract class PlayerList {
                 Optional optional;
 
                 if (blockposition != null) {
-                    optional = EntityHuman.getBed(worldserver1, blockposition, f, flag1, flag);
+                    optional = EntityHuman.getBed(worldserver1, blockposition, f, flag1, true); // Paper - Fix SPIGOT-5989
                 } else {
                     optional = Optional.empty();
                 }
@@ -903,7 +905,12 @@ public abstract class PlayerList {
             }
             // Spigot End
 
-            location = respawnEvent.getRespawnLocation();
+            // Paper start - Fix SPIGOT-5989
+            if (!location.equals(respawnEvent.getRespawnLocation()) ) {
+                location = respawnEvent.getRespawnLocation();
+                isLocAltered = true;
+            }
+            // Paper end
             if (!flag) entityplayer.reset(); // SPIGOT-4785
             isRespawn = true; // Paper
         } else {
@@ -941,8 +948,12 @@ public abstract class PlayerList {
         }
         // entityplayer1.syncInventory();
         entityplayer1.setHealth(entityplayer1.getHealth());
-        if (flag2) {
-            entityplayer1.playerConnection.sendPacket(new PacketPlayOutNamedSoundEffect(SoundEffects.BLOCK_RESPAWN_ANCHOR_DEPLETE, SoundCategory.BLOCKS, (double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ(), 1.0F, 1.0F));
+        // Paper start - Fix SPIGOT-5989
+        if (flag2 && !isLocAltered) {
+            IBlockData data = worldserver1.getType(blockposition);
+            worldserver1.setTypeAndData(blockposition, data.set(BlockRespawnAnchor.a, data.get(BlockRespawnAnchor.a) - 1), 3);
+            entityplayer1.playerConnection.sendPacket(new PacketPlayOutNamedSoundEffect(SoundEffects.BLOCK_RESPAWN_ANCHOR_DEPLETE, SoundCategory.BLOCKS, (double) location.getX(), (double) location.getY(), (double) location.getZ(), 1.0F, 1.0F));
+        // Paper end
         }
         // Added from changeDimension
         updateClient(entityplayer); // Update health, etc...