demo_imgui_bundle: band aid fix for #293

Author: pthom

bindings/imgui_bundle/demos_python/demo_imgui_bundle.py

@@ -23,6 +23,8 @@
 
 
 def show_module_demo(demo_filename: str, demo_function: Callable[[], None]) -> None:
+    if imgui.get_frame_count() < 2:  # cf https://github.com/pthom/imgui_bundle/issues/293
+        return
     if imgui.collapsing_header("Code for this demo"):
         demo_utils.show_python_vs_cpp_file(demo_filename)
     demo_function()