From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: chickeneer <emcchickeneer@gmail.com>
Date: Thu, 22 Apr 2021 19:02:07 -0700
Subject: [PATCH] fix PlayerItemHeldEvent firing twice


diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 0b6db265a2a7a20be647bf6e3387af20634af68c..4b9b8cda8578c871c677f283ba0746460a0fadf0 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1933,6 +1933,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
         PacketUtils.ensureRunningOnSameThread(packet, this, this.player.serverLevel());
         if (this.player.isImmobile()) return; // CraftBukkit
         if (packet.getSlot() >= 0 && packet.getSlot() < Inventory.getSelectionSize()) {
+            if (packet.getSlot() == this.player.getInventory().selected) { return; } // Paper - don't fire itemheldevent when there wasn't a slot change
             PlayerItemHeldEvent event = new PlayerItemHeldEvent(this.getCraftPlayer(), this.player.getInventory().selected, packet.getSlot());
             this.cserver.getPluginManager().callEvent(event);
             if (event.isCancelled()) {