Paper/patch-remap/mache-spigotflower-stripped/net/minecraft/core/dispenser/AbstractProjectileDispenseBehavior.java.patch

--- a/net/minecraft/core/dispenser/AbstractProjectileDispenseBehavior.java
+++ b/net/minecraft/core/dispenser/AbstractProjectileDispenseBehavior.java
@@ -7,6 +6,13 @@
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.DispenserBlock;
+// CraftBukkit start
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.projectile.Projectile;
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.event.block.BlockDispenseEvent;
+// CraftBukkit end
 
 public abstract class AbstractProjectileDispenseBehavior extends DefaultDispenseItemBehavior {
 
@@ -20,9 +25,38 @@
         Direction direction = (Direction) blocksource.state().getValue(DispenserBlock.FACING);
         Projectile projectile = this.getProjectile(serverlevel, position, itemstack);
 
-        projectile.shoot((double) direction.getStepX(), (double) ((float) direction.getStepY() + 0.1F), (double) direction.getStepZ(), this.getPower(), this.getUncertainty());
-        serverlevel.addFreshEntity(projectile);
-        itemstack.shrink(1);
+        // CraftBukkit start
+        // iprojectile.shoot((double) enumdirection.getStepX(), (double) ((float) enumdirection.getStepY() + 0.1F), (double) enumdirection.getStepZ(), this.getPower(), this.getUncertainty());
+        ItemStack itemstack1 = itemstack.split(1);
+        org.bukkit.block.Block block = CraftBlock.at(worldserver, sourceblock.pos());
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
+
+        BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector((double) enumdirection.getStepX(), (double) ((float) enumdirection.getStepY() + 0.1F), (double) enumdirection.getStepZ()));
+        if (!DispenserBlock.eventFired) {
+            worldserver.getCraftServer().getPluginManager().callEvent(event);
+        }
+
+        if (event.isCancelled()) {
+            itemstack.grow(1);
+            return itemstack;
+        }
+
+        if (!event.getItem().equals(craftItem)) {
+            itemstack.grow(1);
+            // Chain to handler for new item
+            ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
+            DispenseItemBehavior idispensebehavior = (DispenseItemBehavior) DispenserBlock.DISPENSER_REGISTRY.get(eventStack.getItem());
+            if (idispensebehavior != DispenseItemBehavior.NOOP && idispensebehavior != this) {
+                idispensebehavior.dispense(sourceblock, eventStack);
+                return itemstack;
+            }
+        }
+
+        iprojectile.shoot(event.getVelocity().getX(), event.getVelocity().getY(), event.getVelocity().getZ(), this.getPower(), this.getUncertainty());
+        ((Entity) iprojectile).projectileSource = new org.bukkit.craftbukkit.projectiles.CraftBlockProjectileSource(sourceblock.blockEntity());
+        // CraftBukkit end
+        worldserver.addFreshEntity(iprojectile);
+        // itemstack.shrink(1); // CraftBukkit - Handled during event processing
         return itemstack;
     }