Resize seems not working

[caxieyou]

the resize window size is const in Rust, so i suppose it's not changed according to the new size
also the callback function about if the window size is changed never actually works
which means the is_framebuffer_resized flag is always false

[DotrixXP]

You can explicitly set is_framebuffer_resized when is windows resized.
WindowEvent::Resized(new_size) => { self.is_framebuffer_resized = true; }