The worst thing is using C++ for a GUI engine. Don't do that mistake again! The code looks quite weak at the first glance, but at least not so ugly as average

The worst thing is using C++ for a GUI engine. Don't do that mistake again! The code looks quite weak at the first glance, but at least not so ugly as average open-source code. The architecture solutions seem a bit weak too, even weaker than a GUI engine I have written being a junior developer. Overall, their code seems to be written by a junior developer. Seems to be too ambitious so far. The problem is that it is actually really hard to make a proper GUI engine. It requires enormous experience and amount of expertise, like you can come up with something decent after building a few your own engines and closely analyzing existing solutions.