PaperMC/nms-patches/EntityAreaEffectCloud.patch

--- a/net/minecraft/server/EntityAreaEffectCloud.java
+++ b/net/minecraft/server/EntityAreaEffectCloud.java
@@ -10,6 +10,10 @@
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
+
+import org.bukkit.craftbukkit.entity.CraftLivingEntity; // CraftBukkit
+import org.bukkit.entity.LivingEntity; // CraftBukkit
+
 import java.util.Map.Entry;
 import javax.annotation.Nullable;
 import org.apache.logging.log4j.LogManager;
@@ -102,6 +106,22 @@
 
     }
 
+    // CraftBukkit start accessor methods
+    public void refreshEffects() {
+        if (!this.hasColor) {
+            this.getDataWatcher().set(EntityAreaEffectCloud.c, Integer.valueOf(PotionUtil.a((Collection) PotionUtil.a(this.potionRegistry, (Collection) this.effects)))); // PAIL: rename
+        }
+    }
+
+    public String getType() {
+        return ((MinecraftKey) IRegistry.POTION.getKey(this.potionRegistry)).toString();
+    }
+
+    public void setType(String string) {
+        a(IRegistry.POTION.get(new MinecraftKey(string)));
+    }
+    // CraftBukkit end
+
     public int getColor() {
         return ((Integer) this.getDataWatcher().get(EntityAreaEffectCloud.c)).intValue();
     }
@@ -245,6 +265,7 @@
                     if (!list.isEmpty()) {
                         Iterator iterator2 = list.iterator();
 
+                        List<LivingEntity> entities = new ArrayList<LivingEntity>(); // CraftBukkit
                         while (iterator2.hasNext()) {
                             EntityLiving entityliving = (EntityLiving) iterator2.next();
 
@@ -254,6 +275,17 @@
                                 double d2 = d0 * d0 + d1 * d1;
 
                                 if (d2 <= (double) (f * f)) {
+                                    // CraftBukkit start
+                                    entities.add((LivingEntity) entityliving.getBukkitEntity());
+                                }
+                            }
+                        }
+                        org.bukkit.event.entity.AreaEffectCloudApplyEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callAreaEffectCloudApplyEvent(this, entities);
+                        if (true) { // Preserve NMS spacing and bracket count for smallest diff
+                            for (LivingEntity entity : event.getAffectedEntities()) {
+                                if (entity instanceof CraftLivingEntity) {
+                                    EntityLiving entityliving = ((CraftLivingEntity) entity).getHandle();
+                                    // CraftBukkit end
                                     this.h.put(entityliving, Integer.valueOf(this.ticksLived + this.reapplicationDelay));
                                     Iterator iterator3 = arraylist.iterator();
 
@@ -263,7 +295,7 @@
                                         if (mobeffect1.getMobEffect().isInstant()) {
                                             mobeffect1.getMobEffect().applyInstantEffect(this, this.getSource(), entityliving, mobeffect1.getAmplifier(), 0.5D);
                                         } else {
-                                            entityliving.addEffect(new MobEffect(mobeffect1));
+                                            entityliving.addEffect(new MobEffect(mobeffect1), org.bukkit.event.entity.EntityPotionEffectEvent.Cause.AREA_EFFECT_CLOUD); // CraftBukkit
                                         }
                                     }