From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: EpicPlayerA10 <adasko.lesiak@gmail.com>
Date: Sun, 18 Jun 2023 12:38:24 +0200
Subject: [PATCH] Don't tab-complete namespaced commands if send-namespaced is
 false

Tab-complete packet is supposed to tab-complete args for commands, but
it also can suggest commands like in version 1.12.2 or lower.

This patch prevents server from sending namespaced commands when player
requests tab-complete only commands.

diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 2eb497b87ac02a97242073cfdaad08019d68a47e..4871b8fd48cdae2bf65323e3bd716a8124b2ff6f 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -920,6 +920,11 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
                         ParseResults<CommandSourceStack> parseresults = this.server.getCommands().getDispatcher().parse(stringreader, this.player.createCommandSourceStack());
 
                         this.server.getCommands().getDispatcher().getCompletionSuggestions(parseresults).thenAccept((suggestions) -> {
+                            // Paper start - Don't tab-complete namespaced commands if send-namespaced is false
+                            if (!org.spigotmc.SpigotConfig.sendNamespaced && suggestions.getRange().getStart() <= 1) {
+                                suggestions.getList().removeIf(suggestion -> suggestion.getText().contains(":"));
+                            }
+                            // Paper end
                             // Paper start - Brigadier API
                             com.destroystokyo.paper.event.brigadier.AsyncPlayerSendSuggestionsEvent suggestEvent = new com.destroystokyo.paper.event.brigadier.AsyncPlayerSendSuggestionsEvent(this.getCraftPlayer(), suggestions, command);
                             suggestEvent.setCancelled(suggestions.isEmpty());