PaperMC/patches/server/1049-Fix-CraftBukkit-drag-system.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Tamion <70228790+notTamion@users.noreply.github.com>
Date: Sun, 26 May 2024 22:20:21 +0200
Subject: [PATCH] Fix CraftBukkit drag system

== AT ==
public net.minecraft.world.inventory.AbstractContainerMenu quickcraftSlots
public net.minecraft.world.inventory.AbstractContainerMenu quickcraftStatus
public net.minecraft.world.inventory.AbstractContainerMenu quickcraftType
public net.minecraft.world.inventory.AbstractContainerMenu resetQuickCraft()V

diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 156c185a08adc602715890506cbe959e1f085094..7699793451e62d952403efb7ac5e77db6c4f5328 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -3127,6 +3127,25 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                             }
                             break;
                         case QUICK_CRAFT:
+                            // Paper start - Fix CraftBukkit drag system
+                            AbstractContainerMenu containerMenu = this.player.containerMenu;
+                            int currentStatus = this.player.containerMenu.quickcraftStatus;
+                            int newStatus = AbstractContainerMenu.getQuickcraftHeader(packet.getButtonNum());
+                            if ((currentStatus != 1 || newStatus != 2 && currentStatus != newStatus)) {
+                            } else if (containerMenu.getCarried().isEmpty()) {
+                            } else if (newStatus == 0) {
+                            } else if (newStatus == 1) {
+                            } else if (newStatus == 2) {
+                                if (!this.player.containerMenu.quickcraftSlots.isEmpty()) {
+                                    if (this.player.containerMenu.quickcraftSlots.size() == 1) {
+                                        int index = containerMenu.quickcraftSlots.iterator().next().index;
+                                        containerMenu.resetQuickCraft();
+                                        this.handleContainerClick(new ServerboundContainerClickPacket(packet.getContainerId(), packet.getStateId(), index, containerMenu.quickcraftType, net.minecraft.world.inventory.ClickType.PICKUP, packet.getCarriedItem(), packet.getChangedSlots()));
+                                        return;
+                                    }
+                                }
+                            }
+                            // Paper end - Fix CraftBukkit drag system
                             this.player.containerMenu.clicked(packet.getSlotNum(), packet.getButtonNum(), packet.getClickType(), this.player);
                             break;
                         case PICKUP_ALL:
diff --git a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
index 46159a127d910028c62ada90ff2d2dccc3b62fc3..dd4218e108f87f3305b76fbc8d88f488b447c609 100644
--- a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
@@ -431,7 +431,7 @@ public abstract class AbstractContainerMenu {
                 }
             } else if (this.quickcraftStatus == 2) {
                 if (!this.quickcraftSlots.isEmpty()) {
-                    if (false && this.quickcraftSlots.size() == 1) { // CraftBukkit - treat everything as a drag since we are unable to easily call InventoryClickEvent instead
+                    if (this.quickcraftSlots.size() == 1) { // Paper - Fix CraftBukkit drag system
                         k = ((Slot) this.quickcraftSlots.iterator().next()).index;
                         this.resetQuickCraft();
                         this.doClick(k, this.quickcraftType, ClickType.PICKUP, player);