Fixed not being able to toggle delegated spells

src/main/java/com/minelittlepony/unicopia/ability/magic/SpellContainer.java

@@ -129,6 +129,10 @@ public interface SpellContainer {
     public enum Operation {
         SKIP,
         KEEP,
-        REMOVE
+        REMOVE;
+
+        public static Operation ofBoolean(boolean result) {
+            return result ? KEEP : REMOVE;
+        }
     }
 }

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/AbstractDelegatingSpell.java

@@ -3,6 +3,7 @@ package com.minelittlepony.unicopia.ability.magic.spell;
 import java.util.Collection;
 import java.util.UUID;
 import java.util.function.Function;
+import java.util.function.Predicate;
 import java.util.stream.Stream;
 
 import com.minelittlepony.unicopia.Affinity;
@@ -36,6 +37,11 @@ public abstract class AbstractDelegatingSpell implements ProjectileSpell {
         return ProjectileSpell.super.equalsOrContains(id) || getDelegates().stream().anyMatch(s -> s.equalsOrContains(id));
     }
 
+    @Override
+    public Stream<Spell> findMatches(Predicate<Spell> predicate) {
+        return Stream.concat(ProjectileSpell.super.findMatches(predicate), getDelegates().stream().flatMap(s -> s.findMatches(predicate)));
+    }
+
     @Override
     public Affinity getAffinity() {
         return Affinity.NEUTRAL;

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/Spell.java

@@ -1,6 +1,8 @@
 package com.minelittlepony.unicopia.ability.magic.spell;
 
 import java.util.UUID;
+import java.util.function.Predicate;
+import java.util.stream.Stream;
 
 import org.spongepowered.include.com.google.common.base.Objects;
 
@@ -32,6 +34,13 @@ public interface Spell extends NbtSerialisable, Affine {
         return Objects.equal(getUuid(), id);
     }
 
+    /**
+     * Returns an optional containing the spell that matched the given predicate.
+     */
+    default Stream<Spell> findMatches(Predicate<Spell> predicate) {
+        return predicate.test(this) ? Stream.of(this) : Stream.empty();
+    }
+
     /**
      * Sets this effect as dead.
      */

src/main/java/com/minelittlepony/unicopia/entity/CastSpellEntity.java

@@ -74,6 +74,7 @@ public class CastSpellEntity extends Entity implements Caster<LivingEntity> {
         return super.getName();
     }
 
+    @SuppressWarnings("deprecation")
     @Override
     public void tick() {
         super.tick();
@@ -113,10 +114,7 @@ public class CastSpellEntity extends Entity implements Caster<LivingEntity> {
 
         if (!dataTracker.get(SPELL).filter(spellId -> {
             return getSpellSlot().forEach(spell -> {
-                if (!spell.getUuid().equals(spellId)) {
-                    return Operation.SKIP;
-                }
-                return spell.tick(this, Situation.GROUND_ENTITY) ? Operation.KEEP: Operation.REMOVE;
+                return spell.getUuid().equals(spellId) ? Operation.ofBoolean(spell.tick(this, Situation.GROUND_ENTITY)) : Operation.SKIP;
             }, true);
         }).isPresent()) {
             discard();

src/main/java/com/minelittlepony/unicopia/entity/Living.java

@@ -8,6 +8,7 @@ import org.jetbrains.annotations.Nullable;
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.ability.magic.SpellContainer;
 import com.minelittlepony.unicopia.ability.magic.SpellPredicate;
+import com.minelittlepony.unicopia.ability.magic.SpellContainer.Operation;
 import com.minelittlepony.unicopia.ability.magic.spell.Situation;
 import com.minelittlepony.unicopia.item.UItems;
 import com.minelittlepony.unicopia.network.datasync.EffectSync;
@@ -85,7 +86,7 @@ public abstract class Living<T extends LivingEntity> implements Equine<T>, Caste
 
     @Override
     public void tick() {
-        getSpellSlot().removeIf(effect -> !effect.tick(this, Situation.BODY), true);
+        getSpellSlot().forEach(spell -> Operation.ofBoolean(spell.tick(this, Situation.BODY)), true);
 
         if (invinsibilityTicks > 0) {
             invinsibilityTicks--;

src/main/java/com/minelittlepony/unicopia/network/datasync/EffectSync.java

@@ -68,7 +68,7 @@ public class EffectSync implements SpellContainer {
     @Override
     public boolean removeIf(Predicate<Spell> test, boolean update) {
         return reduce((initial, effect) -> {
-            if (!test.test(effect)) {
+            if (!effect.findMatches(test).findFirst().isPresent()) {
                 return initial;
             }
             spells.removeReference(effect);
@@ -107,7 +107,7 @@ public class EffectSync implements SpellContainer {
         if (type == null) {
             return spells.getReferences();
         }
-        return spells.getReferences().filter(type);
+        return spells.getReferences().flatMap(s -> s.findMatches(type));
     }
 
     public boolean reduce(Alteration alteration) {