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 4918f89401cdf6a85d8b71f3e3a6608239a388bd..83df832b1fe5be1c1114ce3ae10c1985bf564a0c 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -79,6 +79,7 @@ import net.minecraft.world.level.GameRules;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.biome.BiomeManager;
 import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.RespawnAnchorBlock;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.border.BorderChangeListener;
 import net.minecraft.world.level.border.WorldBorder;
@@ -830,6 +831,7 @@ 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
@@ -840,7 +842,7 @@ public abstract class PlayerList {
                 Optional optional;
 
                 if (blockposition != null) {
-                    optional = net.minecraft.world.entity.player.Player.findRespawnPositionAndUseSpawnBlock(worldserver1, blockposition, f, flag1, flag);
+                    optional = net.minecraft.world.entity.player.Player.findRespawnPositionAndUseSpawnBlock(worldserver1, blockposition, f, flag1, true); // Paper - Fix SPIGOT-5989
                 } else {
                     optional = Optional.empty();
                 }
@@ -883,7 +885,12 @@ 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 {
@@ -921,8 +928,12 @@ public abstract class PlayerList {
         }
         // entityplayer1.syncInventory();
         entityplayer1.setHealth(entityplayer1.getHealth());
-        if (flag2) {
-            entityplayer1.connection.send(new ClientboundSoundPacket(SoundEvents.RESPAWN_ANCHOR_DEPLETE, SoundSource.BLOCKS, (double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ(), 1.0F, 1.0F));
+        // Paper start - Fix SPIGOT-5989
+        if (flag2 && !isLocAltered) {
+            BlockState data = worldserver1.getBlockState(blockposition);
+            worldserver1.setBlock(blockposition, data.setValue(RespawnAnchorBlock.CHARGE, data.getValue(RespawnAnchorBlock.CHARGE) - 1), 3);
+            entityplayer1.connection.send(new ClientboundSoundPacket(SoundEvents.RESPAWN_ANCHOR_DEPLETE, SoundSource.BLOCKS, (double) location.getX(), (double) location.getY(), (double) location.getZ(), 1.0F, 1.0F));
+        // Paper end
         }
         // Added from changeDimension
         this.sendAllPlayerInfo(entityplayer); // Update health, etc...