Description
The class IDrawable in OvUI::API doesn't contains a virtual destructor. It sounds harmless and it might be since compilers probably fills that by itself, however the lack of a virtual destructor in this situation may result in an undefined behavior when deleting a derived-class.

Expected resolution
For good mesure and best practice it is better to define that virtual destructor by ourself in IDrawable by adding :

protected:
    virtual ~IDrawable() = default;

That should guarantee a proper dynamic dispatch mechanism when destroying at runtime (derived-class to base-class)