We're going on an Adventure! (#4842)

Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
Co-authored-by: zml <zml@stellardrift.ca>
Co-authored-by: Mariell Hoversholm <proximyst@proximyst.com>

Spigot-Server-Patches/0170-handle-PacketPlayInKeepAlive-async.patch

@@ -1,40 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Shane Freeder <theboyetronic@gmail.com>
-Date: Thu, 5 Oct 2017 01:54:07 +0100
-Subject: [PATCH] handle PacketPlayInKeepAlive async
-
-In 1.12.2, Mojang moved the processing of PacketPlayInKeepAlive off the main
-thread, while entirely correct for the server, this causes issues with
-plugins which are expecting the PlayerQuitEvent on the main thread.
-
-In order to counteract some bad behavior, we will post handling of the
-disconnection to the main thread, but leave the actual processing of the packet
-off the main thread.
-
-also adding some additional logging in order to help work out what is causing
-random disconnections for clients.
-
-diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
-index 5429e91dec8aa29d8c641db09a1b4de0acd0f5bb..5b74b394bb832699d2d54030ee691fbe9648f170 100644
---- a/src/main/java/net/minecraft/server/PlayerConnection.java
-+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
-@@ -2619,14 +2619,18 @@ public class PlayerConnection implements PacketListenerPlayIn {
- 
-     @Override
-     public void a(PacketPlayInKeepAlive packetplayinkeepalive) {
--        PlayerConnectionUtils.ensureMainThread(packetplayinkeepalive, this, this.player.getWorldServer()); // CraftBukkit
-+        //PlayerConnectionUtils.ensureMainThread(packetplayinkeepalive, this, this.player.getWorldServer()); // CraftBukkit // Paper - This shouldn't be on the main thread
-         if (this.awaitingKeepAlive && packetplayinkeepalive.b() == this.h) {
-             int i = (int) (SystemUtils.getMonotonicMillis() - this.lastKeepAlive);
- 
-             this.player.ping = (this.player.ping * 3 + i) / 4;
-             this.awaitingKeepAlive = false;
-         } else if (!this.isExemptPlayer()) {
-+            // Paper start - This needs to be handled on the main thread for plugins
-+            minecraftServer.scheduleOnMain(() -> {
-             this.disconnect(new ChatMessage("disconnect.timeout"));
-+            });
-+            // Paper end
-         }
- 
-     }