Fix command pool submitting on shutdown (#8272)

patches/server/0296-Async-command-map-building.patch

@@ -9,10 +9,10 @@ commands if the server is restarting. Using the default async pool caused issues
 due to the shutdown logic generally being much later.
 
 diff --git a/src/main/java/net/minecraft/commands/Commands.java b/src/main/java/net/minecraft/commands/Commands.java
-index 2bf67468a6c745bc6243c65210477ba129bfcb07..91b32a4856a4c9d6dc12871ed080f7a67311ead0 100644
+index 2bf67468a6c745bc6243c65210477ba129bfcb07..c4315531f93f4ed68b4621157b02572886e1ed30 100644
 --- a/src/main/java/net/minecraft/commands/Commands.java
 +++ b/src/main/java/net/minecraft/commands/Commands.java
-@@ -360,6 +360,23 @@ public class Commands {
+@@ -360,6 +360,24 @@ public class Commands {
          if ( org.spigotmc.SpigotConfig.tabComplete < 0 ) return; // Spigot
          // CraftBukkit start
          // Register Vanilla commands into builtRoot as before
@@ -28,7 +28,8 @@ index 2bf67468a6c745bc6243c65210477ba129bfcb07..91b32a4856a4c9d6dc12871ed080f7a6
 +        new com.google.common.util.concurrent.ThreadFactoryBuilder()
 +            .setNameFormat("Paper Async Command Builder Thread Pool - %1$d")
 +            .setUncaughtExceptionHandler(new net.minecraft.DefaultUncaughtExceptionHandlerWithName(net.minecraft.server.MinecraftServer.LOGGER))
-+            .build()
++            .build(),
++        new java.util.concurrent.ThreadPoolExecutor.DiscardPolicy()
 +    );
 +
 +    private void sendAsync(ServerPlayer player) {
@@ -36,7 +37,7 @@ index 2bf67468a6c745bc6243c65210477ba129bfcb07..91b32a4856a4c9d6dc12871ed080f7a6
          Map<CommandNode<CommandSourceStack>, CommandNode<SharedSuggestionProvider>> map = Maps.newIdentityHashMap(); // Use identity to prevent aliasing issues
          RootCommandNode vanillaRoot = new RootCommandNode();
  
-@@ -377,7 +394,14 @@ public class Commands {
+@@ -377,7 +395,14 @@ public class Commands {
          for (CommandNode node : rootcommandnode.getChildren()) {
              bukkit.add(node.getName());
          }