Feedback for tutorial requested

I was examining user interface libraries for Rust and decided to try to implement our 101 programming course assignment for showing the Mandelbrot set with gtk-rs. I got a bit carried away and the thing turned into a tutorial.

As this was my first gtk-rs project, there is of course the possibility that it contains errors, non idiomatic code or misses opportunities to explain important things. So any comments would be much appreciated.

Hello, I only looked at it a little but IMO you may want to experiment with rendering the fractal on the GPU such as in this article: Mandelbrot Fractals in OpenGL

This should perform much faster than even a multicore SIMD-accelerated CPU rendering.

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