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 2d75a19def131b63e238dd81bb651834ed53df6b..20fe7dd46b8b641fe628695f17edac42fd000bb6 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -794,6 +794,7 @@ 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
@@ -804,7 +805,7 @@ 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();
                 }
@@ -848,7 +849,12 @@ 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 {
@@ -888,8 +894,14 @@ public abstract class PlayerList {
         }
         // entityplayer1.initInventoryMenu();
         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, worldserver1.getRandom().nextLong()));
+        // Paper start - Fix SPIGOT-5989
+        if (flag2 && !isLocAltered) {
+            if (!flag1) {
+                BlockState data = worldserver1.getBlockState(blockposition);
+                worldserver1.setBlock(blockposition, data.setValue(net.minecraft.world.level.block.RespawnAnchorBlock.CHARGE, data.getValue(net.minecraft.world.level.block.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, worldserver1.getRandom().nextLong()));
+        // Paper end
         }
         // Added from changeDimension
         this.sendAllPlayerInfo(entityplayer); // Update health, etc...