diff --git a/res/layouts/code_editor.xml b/res/layouts/code_editor.xml
index 4336ee4f..e684ccec 100644
--- a/res/layouts/code_editor.xml
+++ b/res/layouts/code_editor.xml
@@ -53,6 +53,7 @@
                 text-wrap='false'
                 scroll-step='50'
             ></textbox>
+            <modelviewer size="480" model="stairs" center="0.5,0.5,0.5" cam-rotation="45,-45,0" gravity="top-right"/>
         </container>
         <splitbox orientation="horizontal" split-pos="0.4">
             <panel id="traceback" padding="4" color="#000000A0">
diff --git a/src/graphics/core/DrawContext.hpp b/src/graphics/core/DrawContext.hpp
index 7e1e18d5..d9c61c19 100644
--- a/src/graphics/core/DrawContext.hpp
+++ b/src/graphics/core/DrawContext.hpp
@@ -34,7 +34,7 @@ public:
     Batch2D* getBatch2D() const;
     
     const glm::uvec2& getViewport() const;
-    DrawContext sub(Flushable* flushable=nullptr) const;
+    [[nodiscard]] DrawContext sub(Flushable* flushable=nullptr) const;
 
     void setViewport(const glm::uvec2& viewport);
     void setFramebuffer(Framebuffer* fbo);