Paper/nms-patches/EntitySnowman.patch

--- a/net/minecraft/server/EntitySnowman.java
+++ b/net/minecraft/server/EntitySnowman.java
@@ -1,6 +1,10 @@
 package net.minecraft.server;
 
 import javax.annotation.Nullable;
+// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.player.PlayerShearEntityEvent;
+// CraftBukkit end
 
 public class EntitySnowman extends EntityGolem implements IRangedEntity {
 
@@ -62,7 +66,7 @@
             }
 
             if (this.world.getBiome(new BlockPosition(i, 0, k)).getAdjustedTemperature(new BlockPosition(i, j, k)) > 1.0F) {
-                this.damageEntity(DamageSource.BURN, 1.0F);
+                this.damageEntity(CraftEventFactory.MELTING, 1.0F); // CraftBukkit - DamageSource.BURN -> CraftEventFactory.MELTING
             }
 
             if (!this.world.getGameRules().getBoolean("mobGriefing")) {
@@ -78,7 +82,7 @@
                 BlockPosition blockposition = new BlockPosition(i, j, k);
 
                 if (this.world.getType(blockposition).isAir() && this.world.getBiome(blockposition).getAdjustedTemperature(blockposition) < 0.8F && iblockdata.canPlace(this.world, blockposition)) {
-                    this.world.setTypeUpdate(blockposition, iblockdata);
+                    org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this.world, blockposition, iblockdata, this); // CraftBukkit
                 }
             }
         }
@@ -109,6 +113,15 @@
         ItemStack itemstack = entityhuman.b(enumhand);
 
         if (itemstack.getItem() == Items.SHEARS && this.hasPumpkin() && !this.world.isClientSide) {
+            // CraftBukkit start
+            PlayerShearEntityEvent event = new PlayerShearEntityEvent((org.bukkit.entity.Player) entityhuman.getBukkitEntity(), this.getBukkitEntity());
+            this.world.getServer().getPluginManager().callEvent(event);
+
+            if (event.isCancelled()) {
+                return false;
+            }
+            // CraftBukkit end
+
             this.setHasPumpkin(false);
             itemstack.damage(1, entityhuman, (entityhuman1) -> {
                 entityhuman1.d(enumhand);