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))
     }

src/render/mod.rs

@@ -61,13 +61,13 @@ impl UiRenderer {
 
     pub fn update(&mut self, device: &Device, queue: &Queue, ui: &mut Ui) {
         self.active.clear();
-        for (i, ulayer) in ui.data.layers.iter_mut() {
+        for (i, ulayer) in ui.data.layers.iter_orderless_mut() {
             self.active.push(i);
             let primitives = &mut ulayer.primitives;
             for change in primitives.apply_free() {
                 if let Some(inst) = ui.data.active.get_mut(&change.id) {
                     for h in &mut inst.primitives {
-                        if h.inst_idx == change.old {
+                        if h.layer == i && h.inst_idx == change.old {
                             h.inst_idx = change.new;
                             break;
                         }