Paper/Spigot-Server-Patches/0411-Block-Entity-remove-from-being-called-on-Players.patch

From 180010dcd9ff9844849ea2416ca3c4046231b5d3 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach@zachbr.io>
Date: Mon, 4 Feb 2019 23:33:24 -0500
Subject: [PATCH] Block Entity#remove from being called on Players

This doesn't result in the same behavior as other entities and causes
several problems. Anyone ever complain about the "Cannot send chat
message" thing? That's one of the issues this causes, among others.

If a plugin developer can come up with a valid reason to call this on a
Player we will look at limiting the scope of this change. It appears to
be unintentional in the few cases we've seen so far.

diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 8e0cac8df..76d5eaa7f 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -1937,6 +1937,15 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     public void resetCooldown() {
         getHandle().resetCooldown();
     }
+
+    @Override
+    public void remove() {
+        if (this.getHandle().getClass().equals(EntityPlayer.class)) { // special case for NMS plugins inheriting
+            throw new UnsupportedOperationException("Calling Entity#remove on players produces undefined (bad) behavior");
+        } else {
+            super.remove();
+        }
+    }
     //Paper end
 
     // Spigot start
-- 
2.21.0