Fix MI pipes being invisible when faster_item_rendering is enabled

Author: embeddedt

common/src/main/java/org/embeddedt/modernfix/common/mixin/perf/faster_item_rendering/ItemRendererMixin.java

@@ -23,10 +23,13 @@
 public abstract class ItemRendererMixin {
     private ItemTransforms.TransformType transformType;
     private final SimpleItemModelView modelView = new SimpleItemModelView();
+    private boolean mfix$isTopLevelSimpleModel;
 
     @Inject(method = "render", at = @At("HEAD"))
     private void markRenderingType(ItemStack itemStack, ItemTransforms.TransformType transformType, boolean leftHand, PoseStack matrixStack, MultiBufferSource buffer, int combinedLight, int combinedOverlay, BakedModel model, CallbackInfo ci) {
         this.transformType = transformType;
+        // used as renderModelLists may be called by custom model renderers
+        this.mfix$isTopLevelSimpleModel = model != null && model.getClass() == SimpleBakedModel.class;
     }
 
     /**
@@ -39,7 +42,7 @@ private void markRenderingType(ItemStack itemStack, ItemTransforms.TransformType
      */
     @ModifyVariable(method = "renderModelLists", at = @At("HEAD"), index = 1, argsOnly = true)
     private BakedModel useSimpleWrappedItemModel(BakedModel model, BakedModel arg, ItemStack stack, int combinedLight, int combinedOverlay, PoseStack matrixStack, VertexConsumer buffer) {
-        if(!RenderState.IS_RENDERING_LEVEL && !stack.isEmpty() && model.getClass() == SimpleBakedModel.class && transformType == ItemTransforms.TransformType.GUI) {
+        if(!RenderState.IS_RENDERING_LEVEL && !stack.isEmpty() && mfix$isTopLevelSimpleModel && model.getClass() == SimpleBakedModel.class && transformType == ItemTransforms.TransformType.GUI) {
             FastItemRenderType type;
             ItemTransform transform = model.getTransforms().gui;
             if(transform == ItemTransform.NO_TRANSFORM)