fix layer mismatch with apply free in renderer

src/layout/layer.rs

@@ -97,6 +97,10 @@ impl Layers {
         LayerIteratorMut::new(&mut self.vec, self.last)
     }
 
+    pub fn iter_orderless_mut(&mut self) -> impl Iterator<Item = (usize, &mut Layer)> {
+        self.vec.iter_mut().map(|n| &mut n.data).enumerate()
+    }
+
     pub fn iter(&self) -> impl Iterator<Item = (usize, &Layer)> {
         self.indices().map(|i| (i, &self.vec[i].data))
     }