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 54aba3118157f72491cb8c3d5fb5c63750ea6878..4959c1cc9f1ceead9da42e6d12903d13882a1c17 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -804,6 +804,7 @@ public abstract class PlayerList {
         // Paper start - Add PlayerPostRespawnEvent
         boolean isBedSpawn = false;
         boolean isRespawn = false;
+        boolean isLocAltered = false; // Paper - Fix SPIGOT-5989
         // Paper end - Add PlayerPostRespawnEvent
 
         // CraftBukkit start - fire PlayerRespawnEvent
@@ -814,7 +815,7 @@ 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();
                 }
@@ -858,7 +859,12 @@ 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 - Fix SPIGOT-5989
             if (!flag) entityplayer.reset(); // SPIGOT-4785
             isRespawn = true; // Paper - Add PlayerPostRespawnEvent
         } else {
@@ -896,8 +902,14 @@ 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 - Fix SPIGOT-5989
         }
         // Added from changeDimension
         this.sendAllPlayerInfo(entityplayer); // Update health, etc...