From b4acc74e0af93ad88f7629e47f7c1edb98d542b0 Mon Sep 17 00:00:00 2001
From: "Eevee (Evelyn Woods)" <eevee.git@veekun.com>
Date: Sun, 10 Jan 2021 14:44:23 -0700
Subject: [PATCH] Explicitly allow VFX to erase other VFX (otherwise undo
 breaks!)

---
 js/game.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/js/game.js b/js/game.js
index 80ababf..fc77e51 100644
--- a/js/game.js
+++ b/js/game.js
@@ -2279,6 +2279,13 @@ export class Level extends LevelInterface {
 
     spawn_animation(cell, name) {
         let type = TILE_TYPES[name];
+        // Spawned VFX erase any existing VFX
+        if (type.layer === LAYERS.vfx) {
+            let vfx = cell[type.layer];
+            if (vfx) {
+                this.remove_tile(vfx);
+            }
+        }
         let tile = new Tile(type);
         // Co-opt movement_cooldown/speed for these despite that they aren't moving, since those
         // properties are also used to animate everything else anyway.  Decrement the cooldown