PaperMC/nms-patches/ItemMinecart.patch

--- a/net/minecraft/server/ItemMinecart.java
+++ b/net/minecraft/server/ItemMinecart.java
@@ -1,5 +1,10 @@
 package net.minecraft.server;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.event.block.BlockDispenseEvent;
+// CraftBukkit end
+
 public class ItemMinecart extends Item {
 
     private static final IDispenseBehavior a = new DispenseBehaviorItem() {
@@ -37,14 +42,43 @@
                 }
             }
 
-            EntityMinecartAbstract entityminecartabstract = EntityMinecartAbstract.a(world, d0, d1 + d3, d2, ((ItemMinecart) itemstack.getItem()).b);
+            // CraftBukkit start
+            // EntityMinecartAbstract entityminecartabstract = EntityMinecartAbstract.a(world, d0, d1 + d3, d2, ((ItemMinecart) itemstack.getItem()).b);
+            ItemStack itemstack1 = itemstack.cloneAndSubtract(1);
+            org.bukkit.block.Block block2 = world.getWorld().getBlockAt(isourceblock.getBlockPosition().getX(), isourceblock.getBlockPosition().getY(), isourceblock.getBlockPosition().getZ());
+            CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
+
+            BlockDispenseEvent event = new BlockDispenseEvent(block2, craftItem.clone(), new org.bukkit.util.Vector(d0, d1 + d3, d2));
+            if (!BlockDispenser.eventFired) {
+                world.getServer().getPluginManager().callEvent(event);
+            }
+
+            if (event.isCancelled()) {
+                itemstack.count++;
+                return itemstack;
+            }
+
+            if (!event.getItem().equals(craftItem)) {
+                itemstack.count++;
+                // Chain to handler for new item
+                ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
+                IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.REGISTRY.get(eventStack.getItem());
+                if (idispensebehavior != IDispenseBehavior.NONE && idispensebehavior != this) {
+                    idispensebehavior.a(isourceblock, eventStack);
+                    return itemstack;
+                }
+            }
+
+            itemstack1 = CraftItemStack.asNMSCopy(event.getItem());
+            EntityMinecartAbstract entityminecartabstract = EntityMinecartAbstract.a(world, event.getVelocity().getX(), event.getVelocity().getY(), event.getVelocity().getZ(), ((ItemMinecart) itemstack1.getItem()).b);
 
             if (itemstack.hasName()) {
                 entityminecartabstract.setCustomName(itemstack.getName());
             }
 
             world.addEntity(entityminecartabstract);
-            itemstack.cloneAndSubtract(1);
+            // itemstack.a(1); // CraftBukkit - handled during event processing
+            // CraftBukkit end
             return itemstack;
         }
 
@@ -75,6 +109,14 @@
                     d0 = 0.5D;
                 }
 
+                // CraftBukkit start - Minecarts
+                org.bukkit.event.player.PlayerInteractEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(entityhuman, org.bukkit.event.block.Action.RIGHT_CLICK_BLOCK, blockposition, enumdirection, itemstack, enumhand);
+
+                if (event.isCancelled()) {
+                    return EnumInteractionResult.PASS;
+                }
+                // CraftBukkit end
+
                 EntityMinecartAbstract entityminecartabstract = EntityMinecartAbstract.a(world, (double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.0625D + d0, (double) blockposition.getZ() + 0.5D, this.b);
 
                 if (itemstack.hasName()) {