PaperMC/paper-server/nms-patches/net/minecraft/world/entity/animal/EntitySheep.patch

--- a/net/minecraft/world/entity/animal/EntitySheep.java
+++ b/net/minecraft/world/entity/animal/EntitySheep.java
@@ -63,6 +63,12 @@
 import net.minecraft.world.level.storage.loot.LootTable;
 import net.minecraft.world.level.storage.loot.LootTables;
 
+// CraftBukkit start
+import net.minecraft.world.item.Item;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.entity.SheepRegrowWoolEvent;
+// CraftBukkit end
+
 public class EntitySheep extends EntityAnimal implements IShearable {
 
     private static final int EAT_ANIMATION_TICKS = 40;
@@ -250,6 +256,11 @@
 
         if (itemstack.is(Items.SHEARS)) {
             if (!this.level().isClientSide && this.readyForShearing()) {
+                // CraftBukkit start
+                if (!CraftEventFactory.handlePlayerShearEntityEvent(entityhuman, this, itemstack, enumhand)) {
+                    return EnumInteractionResult.PASS;
+                }
+                // CraftBukkit end
                 this.shear(SoundCategory.PLAYERS);
                 this.gameEvent(GameEvent.SHEAR, entityhuman);
                 itemstack.hurtAndBreak(1, entityhuman, getSlotForHand(enumhand));
@@ -269,7 +280,9 @@
         int i = 1 + this.random.nextInt(3);
 
         for (int j = 0; j < i; ++j) {
+            this.forceDrops = true; // CraftBukkit
             EntityItem entityitem = this.spawnAtLocation((IMaterial) EntitySheep.ITEM_BY_DYE.get(this.getColor()), 1);
+            this.forceDrops = false; // CraftBukkit
 
             if (entityitem != null) {
                 entityitem.setDeltaMovement(entityitem.getDeltaMovement().add((double) ((this.random.nextFloat() - this.random.nextFloat()) * 0.1F), (double) (this.random.nextFloat() * 0.05F), (double) ((this.random.nextFloat() - this.random.nextFloat()) * 0.1F)));
@@ -362,6 +375,12 @@
 
     @Override
     public void ate() {
+        // CraftBukkit start
+        SheepRegrowWoolEvent event = new SheepRegrowWoolEvent((org.bukkit.entity.Sheep) this.getBukkitEntity());
+        this.level().getCraftServer().getPluginManager().callEvent(event);
+
+        if (event.isCancelled()) return;
+        // CraftBukkit end
         super.ate();
         this.setSheared(false);
         if (this.isBaby()) {
@@ -381,7 +400,7 @@
         EnumColor enumcolor = ((EntitySheep) entityanimal).getColor();
         EnumColor enumcolor1 = ((EntitySheep) entityanimal1).getColor();
         CraftingInput craftinginput = makeCraftInput(enumcolor, enumcolor1);
-        Optional optional = this.level().getRecipeManager().getRecipeFor(Recipes.CRAFTING, craftinginput, this.level()).map((recipeholder) -> {
+        Optional<Item> optional = this.level().getRecipeManager().getRecipeFor(Recipes.CRAFTING, craftinginput, this.level()).map((recipeholder) -> { // CraftBukkit - decompile error
             return ((RecipeCrafting) recipeholder.value()).assemble(craftinginput, this.level().registryAccess());
         }).map(ItemStack::getItem);