Paper/nms-patches/MobEffectList.patch

--- a/net/minecraft/server/MobEffectList.java
+++ b/net/minecraft/server/MobEffectList.java
@@ -8,6 +8,11 @@
 import java.util.function.Supplier;
 import javax.annotation.Nullable;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason;
+// CraftBukkit end
+
 public class MobEffectList {
 
     public static final RegistryMaterials<MinecraftKey, MobEffectList> REGISTRY = new RegistryMaterials();
@@ -26,7 +31,7 @@
     }
 
     public static int getId(MobEffectList mobeffectlist) {
-        return MobEffectList.REGISTRY.a((Object) mobeffectlist);
+        return MobEffectList.REGISTRY.a(mobeffectlist); // CraftBukkit - decompile error
     }
 
     protected MobEffectList(boolean flag, int i) {
@@ -48,11 +53,11 @@
     public void tick(EntityLiving entityliving, int i) {
         if (this == MobEffects.REGENERATION) {
             if (entityliving.getHealth() < entityliving.getMaxHealth()) {
-                entityliving.heal(1.0F);
+                entityliving.heal(1.0F, RegainReason.MAGIC_REGEN); // CraftBukkit
             }
         } else if (this == MobEffects.POISON) {
             if (entityliving.getHealth() > 1.0F) {
-                entityliving.damageEntity(DamageSource.MAGIC, 1.0F);
+                entityliving.damageEntity(CraftEventFactory.POISON, 1.0F);  // CraftBukkit - DamageSource.MAGIC -> CraftEventFactory.POISON
             }
         } else if (this == MobEffects.WITHER) {
             entityliving.damageEntity(DamageSource.WITHER, 1.0F);
@@ -60,14 +65,25 @@
             ((EntityHuman) entityliving).applyExhaustion(0.005F * (float) (i + 1));
         } else if (this == MobEffects.SATURATION && entityliving instanceof EntityHuman) {
             if (!entityliving.world.isClientSide) {
-                ((EntityHuman) entityliving).getFoodData().eat(i + 1, 1.0F);
+                // CraftBukkit start
+                EntityHuman entityhuman = (EntityHuman) entityliving;
+                int oldFoodLevel = entityhuman.getFoodData().foodLevel;
+
+                org.bukkit.event.entity.FoodLevelChangeEvent event = CraftEventFactory.callFoodLevelChangeEvent(entityhuman, i + 1 + oldFoodLevel);
+
+                if (!event.isCancelled()) {
+                    entityhuman.getFoodData().eat(event.getFoodLevel() - oldFoodLevel, 1.0F);
+                }
+
+                ((EntityPlayer) entityhuman).playerConnection.sendPacket(new PacketPlayOutUpdateHealth(((EntityPlayer) entityhuman).getBukkitEntity().getScaledHealth(), entityhuman.getFoodData().foodLevel, entityhuman.getFoodData().saturationLevel));
+                // CraftBukkit end
             }
         } else if ((this != MobEffects.HEAL || entityliving.cp()) && (this != MobEffects.HARM || !entityliving.cp())) {
             if (this == MobEffects.HARM && !entityliving.cp() || this == MobEffects.HEAL && entityliving.cp()) {
                 entityliving.damageEntity(DamageSource.MAGIC, (float) (6 << i));
             }
         } else {
-            entityliving.heal((float) Math.max(4 << i, 0));
+            entityliving.heal((float) Math.max(4 << i, 0), RegainReason.MAGIC); // CraftBukkit
         }
 
     }
@@ -88,7 +104,7 @@
             }
         } else {
             j = (int) (d0 * (double) (4 << i) + 0.5D);
-            entityliving.heal((float) j);
+            entityliving.heal((float) j, RegainReason.MAGIC); // CraftBukkit
         }
 
     }
@@ -217,6 +233,11 @@
         a(28, "slow_falling", (new MobEffectList(false, 16773073)).b(8, 0).l());
         a(29, "conduit_power", (new MobEffectList(false, 1950417)).b(9, 0).l());
         a(30, "dolphins_grace", (new MobEffectList(false, 8954814)).b(10, 0).l());
+        // CraftBukkit start
+        for (Object effect : REGISTRY) {
+            org.bukkit.potion.PotionEffectType.registerPotionEffectType(new org.bukkit.craftbukkit.potion.CraftPotionEffectType((MobEffectList) effect));
+        }
+        // CraftBukkit end
     }
 
     private static void a(int i, String s, MobEffectList mobeffectlist) {