Add Optional Tick Shuffling

This prevents players from 'gaming' the server, and strategically relogging to increase their position in the tick order.

By: md_5 <git@md-5.net>

paper-server/patches/sources/net/minecraft/server/network/ServerConnectionListener.java.patch

@@ -29,3 +29,17 @@
      public SocketAddress startMemoryChannel() {
          List list = this.channels;
          ChannelFuture channelfuture;
+@@ -153,6 +163,13 @@
+         List list = this.connections;
+ 
+         synchronized (this.connections) {
++            // Spigot Start
++            // This prevents players from 'gaming' the server, and strategically relogging to increase their position in the tick order
++            if ( org.spigotmc.SpigotConfig.playerShuffle > 0 && MinecraftServer.currentTick % org.spigotmc.SpigotConfig.playerShuffle == 0 )
++            {
++                Collections.shuffle( this.connections );
++            }
++            // Spigot End
+             Iterator<Connection> iterator = this.connections.iterator();
+ 
+             while (iterator.hasNext()) {

paper-server/src/main/java/org/spigotmc/SpigotConfig.java

@@ -278,4 +278,10 @@ public class SpigotConfig
         SpigotConfig.playerSample = SpigotConfig.getInt( "settings.sample-count", 12 );
         System.out.println( "Server Ping Player Sample Count: " + SpigotConfig.playerSample );
     }
+
+    public static int playerShuffle;
+    private static void playerShuffle()
+    {
+        SpigotConfig.playerShuffle = SpigotConfig.getInt( "settings.player-shuffle", 0 );
+    }
 }