Drop carried item when player has disconnected

Fixes disappearance of held items, when a player gets disconnected and PlayerDropItemEvent is cancelled.
Closes #5036

paper-server/patches/sources/net/minecraft/server/players/PlayerList.java.patch

@@ -381,7 +381,7 @@
  
          if (advancementdataplayer != null) {
              advancementdataplayer.save();
-@@ -334,95 +509,194 @@
+@@ -334,95 +509,202 @@
  
      }
  
@@ -419,6 +419,14 @@
 +        }
 +        // Paper end - Configurable player collision
 +
++        // Paper - Drop carried item when player has disconnected
++        if (!entityplayer.containerMenu.getCarried().isEmpty()) {
++            net.minecraft.world.item.ItemStack carried = entityplayer.containerMenu.getCarried();
++            entityplayer.containerMenu.setCarried(net.minecraft.world.item.ItemStack.EMPTY);
++            entityplayer.drop(carried, false);
++        }
++        // Paper end - Drop carried item when player has disconnected
++
 +        this.save(entityplayer);
 +        if (entityplayer.isPassenger()) {
 +            Entity entity = entityplayer.getRootVehicle();
@@ -614,7 +622,7 @@
  
          if (entityplayer1 != null) {
              set.add(entityplayer1);
-@@ -431,72 +705,160 @@
+@@ -431,72 +713,160 @@
          Iterator iterator1 = set.iterator();
  
          while (iterator1.hasNext()) {
@@ -796,7 +804,7 @@
          return entityplayer1;
      }
  
-@@ -516,15 +878,32 @@
+@@ -516,15 +886,32 @@
      }
  
      public void sendPlayerPermissionLevel(ServerPlayer player) {
@@ -831,7 +839,7 @@
              this.sendAllPlayerInfoIn = 0;
          }
  
-@@ -541,6 +920,25 @@
+@@ -541,6 +928,25 @@
  
      }
  
@@ -857,7 +865,7 @@
      public void broadcastAll(Packet<?> packet, ResourceKey<Level> dimension) {
          Iterator iterator = this.players.iterator();
  
-@@ -554,7 +952,7 @@
+@@ -554,7 +960,7 @@
  
      }
  
@@ -866,7 +874,7 @@
          PlayerTeam scoreboardteam = source.getTeam();
  
          if (scoreboardteam != null) {
-@@ -573,7 +971,7 @@
+@@ -573,7 +979,7 @@
          }
      }
  
@@ -875,7 +883,7 @@
          PlayerTeam scoreboardteam = source.getTeam();
  
          if (scoreboardteam == null) {
-@@ -619,7 +1017,7 @@
+@@ -619,7 +1025,7 @@
      }
  
      public void deop(GameProfile profile) {
@@ -884,7 +892,7 @@
          ServerPlayer entityplayer = this.getPlayer(profile.getId());
  
          if (entityplayer != null) {
-@@ -629,6 +1027,11 @@
+@@ -629,6 +1035,11 @@
      }
  
      private void sendPlayerPermissionLevel(ServerPlayer player, int permissionLevel) {
@@ -896,7 +904,7 @@
          if (player.connection != null) {
              byte b0;
  
-@@ -643,36 +1046,53 @@
+@@ -643,36 +1054,53 @@
              player.connection.send(new ClientboundEntityEventPacket(player, b0));
          }
  
@@ -963,7 +971,7 @@
              if (entityplayer != player && entityplayer.level().dimension() == worldKey) {
                  double d4 = x - entityplayer.getX();
                  double d5 = y - entityplayer.getY();
-@@ -687,10 +1107,12 @@
+@@ -687,10 +1115,12 @@
      }
  
      public void saveAll() {
@@ -976,7 +984,7 @@
      }
  
      public UserWhiteList getWhiteList() {
-@@ -712,15 +1134,19 @@
+@@ -712,15 +1142,19 @@
      public void reloadWhiteList() {}
  
      public void sendLevelInfo(ServerPlayer player, ServerLevel world) {
@@ -1000,7 +1008,7 @@
          }
  
          player.connection.send(new ClientboundGameEventPacket(ClientboundGameEventPacket.LEVEL_CHUNKS_LOAD_START, 0.0F));
-@@ -729,8 +1155,16 @@
+@@ -729,8 +1163,16 @@
  
      public void sendAllPlayerInfo(ServerPlayer player) {
          player.inventoryMenu.sendAllDataToRemote();
@@ -1018,7 +1026,7 @@
      }
  
      public int getPlayerCount() {
-@@ -746,6 +1180,7 @@
+@@ -746,6 +1188,7 @@
      }
  
      public void setUsingWhiteList(boolean whitelistEnabled) {
@@ -1026,7 +1034,7 @@
          this.doWhiteList = whitelistEnabled;
      }
  
-@@ -786,12 +1221,36 @@
+@@ -786,12 +1229,36 @@
      }
  
      public void removeAll() {
@@ -1065,7 +1073,7 @@
      public void broadcastSystemMessage(Component message, boolean overlay) {
          this.broadcastSystemMessage(message, (entityplayer) -> {
              return message;
-@@ -819,24 +1278,43 @@
+@@ -819,24 +1286,43 @@
      }
  
      public void broadcastChatMessage(PlayerChatMessage message, ServerPlayer sender, ChatType.Bound params) {
@@ -1112,7 +1120,7 @@
          }
  
          if (flag1 && sender != null) {
-@@ -845,20 +1323,27 @@
+@@ -845,20 +1331,27 @@
  
      }
  
@@ -1145,7 +1153,7 @@
                  Path path = file2.toPath();
  
                  if (FileUtil.isPathNormalized(path) && FileUtil.isPathPortable(path) && path.startsWith(file.getPath()) && file2.isFile()) {
-@@ -867,7 +1352,7 @@
+@@ -867,7 +1360,7 @@
              }
  
              serverstatisticmanager = new ServerStatsCounter(this.server, file1);
@@ -1154,7 +1162,7 @@
          }
  
          return serverstatisticmanager;
-@@ -875,13 +1360,13 @@
+@@ -875,13 +1368,13 @@
  
      public PlayerAdvancements getPlayerAdvancements(ServerPlayer player) {
          UUID uuid = player.getUUID();
@@ -1170,7 +1178,7 @@
          }
  
          advancementdataplayer.setPlayer(player);
-@@ -932,15 +1417,28 @@
+@@ -932,15 +1425,28 @@
      }
  
      public void reloadResources() {