Merge https://github.com/thedmd/imgui-node-editor

imgui_canvas.cpp

@@ -73,12 +73,6 @@ struct VtxCurrentOffsetRef
     }
 };
 
-static void SentinelDrawCallback(const ImDrawList* /*parent_list*/, const ImDrawCmd* /*cmd*/)
-{
-    // This is a sentinel draw callback, it's only purpose is to mark draw list command.
-    //IM_ASSERT(false && "This draw callback should never be called.");
-}
-
 } // namespace ImCanvasDetails
 
 // Returns a reference to _FringeScale extension to ImDrawList