v0.7.0: fixed:

- spells being upgradeable
- errors when certain bombs explode early
- incorrect magical porter recipe

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/Heap.java

@@ -247,8 +247,9 @@ public class Heap implements Bundlable {
 			} else if (item instanceof Bomb) {
 				items.remove( item );
 				((Bomb) item).explode( pos );
+				burnt = true;
 				//stop processing the burning, it will be replaced by the explosion.
-				return;
+				break;
 			}
 		}
 		

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/spells/MagicalPorter.java

@@ -23,9 +23,9 @@ package com.shatteredpixel.shatteredpixeldungeon.items.spells;
 
 import com.shatteredpixel.shatteredpixeldungeon.Dungeon;
 import com.shatteredpixel.shatteredpixeldungeon.actors.hero.Hero;
-import com.shatteredpixel.shatteredpixeldungeon.actors.mobs.npcs.MirrorImage;
 import com.shatteredpixel.shatteredpixeldungeon.items.Item;
 import com.shatteredpixel.shatteredpixeldungeon.items.MerchantsBeacon;
+import com.shatteredpixel.shatteredpixeldungeon.items.scrolls.ScrollOfMirrorImage;
 import com.shatteredpixel.shatteredpixeldungeon.messages.Messages;
 import com.shatteredpixel.shatteredpixeldungeon.sprites.ItemSpriteSheet;
 import com.shatteredpixel.shatteredpixeldungeon.utils.GLog;
@@ -65,7 +65,7 @@ public class MagicalPorter extends InventorySpell {
 	public static class Recipe extends com.shatteredpixel.shatteredpixeldungeon.items.Recipe.SimpleRecipe {
 		
 		{
-			inputs =  new Class[]{MirrorImage.class, MerchantsBeacon.class};
+			inputs =  new Class[]{ScrollOfMirrorImage.class, MerchantsBeacon.class};
 			inQuantity = new int[]{1, 1};
 			
 			cost = 2;

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/spells/Spell.java

@@ -68,6 +68,11 @@ public abstract class Spell extends Item {
 		return true;
 	}
 	
+	@Override
+	public boolean isUpgradable() {
+		return false;
+	}
+	
 	protected abstract void onCast(Hero hero );
 	
 }