From b8c87c208f804fd92516168befc3c57072bc07b3 Mon Sep 17 00:00:00 2001
From: HaHaWTH <102713261+HaHaWTH@users.noreply.github.com>
Date: Mon, 13 Jul 2026 01:54:49 +0800
Subject: [PATCH] Filter out disallowed control chars

---
 .../sources/net/minecraft/commands/Commands.java.patch    | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/paper-server/patches/sources/net/minecraft/commands/Commands.java.patch b/paper-server/patches/sources/net/minecraft/commands/Commands.java.patch
index f235a2b3a084..504bc8204d7a 100644
--- a/paper-server/patches/sources/net/minecraft/commands/Commands.java.patch
+++ b/paper-server/patches/sources/net/minecraft/commands/Commands.java.patch
@@ -101,7 +101,7 @@
                  StackTraceElement[] stackTrace = e.getStackTrace();
  
                  for (int i = 0; i < Math.min(stackTrace.length, 3); i++) {
-@@ -366,7 +_,11 @@
+@@ -366,12 +_,16 @@
              return ContextChain.tryFlatten(command.getContext().build(commandString))
                  .orElseThrow(() -> CommandSyntaxException.BUILT_IN_EXCEPTIONS.dispatcherUnknownCommand().createWithContext(command.getReader()));
          } catch (CommandSyntaxException e) {
@@ -114,6 +114,12 @@
              if (e.getInput() != null && e.getCursor() >= 0) {
                  int cursor = Math.min(e.getInput().length(), e.getCursor());
                  MutableComponent context = Component.empty()
+                     .withStyle(ChatFormatting.GRAY)
+-                    .withStyle(s -> s.withClickEvent(new ClickEvent.SuggestCommand("/" + commandString)));
++                    .withStyle(s -> s.withClickEvent(new ClickEvent.SuggestCommand("/" + net.minecraft.util.StringUtil.filterText(commandString)))); // Paper - Filter out disallowed control chars
+                 if (cursor > 10) {
+                     context.append(CommonComponents.ELLIPSIS);
+                 }
 @@ -383,7 +_,17 @@
                  }