Unify behavior of resizable across platforms

[kchibisov]

This makes X11 and Wayland follow Windows and macOS, so the size of the
window could be set even though it has resizable attribute set to false.

Fixes #2242.

[kchibisov]

@sourcebox would you mind testing this PR and tell whether it resolves your issue? I think it should resize the window now with set_inner_size.

Also, if you could send me a client to use for testing, I can test Wayland part, since I think you have something working already?

[sourcebox]

@kchibisov I just tested your PR and it works as expected so far. I'm typically not using winit directly but via egui. For testing I just modified the min_max_size example. Here's the full code:

use simple_logger::SimpleLogger;
use winit::{
    dpi::LogicalSize,
    event::{Event, WindowEvent},
    event_loop::{ControlFlow, EventLoop},
    window::WindowBuilder,
};

fn main() {
    SimpleLogger::new().init().unwrap();
    let event_loop = EventLoop::new();

    let window = WindowBuilder::new().build(&event_loop).unwrap();

    window.set_resizable(false);
    window.set_inner_size(LogicalSize::new(200.0, 200.0));

    event_loop.run(move |event, _, control_flow| {
        *control_flow = ControlFlow::Wait;
        println!("{:?}", event);

        match event {
            Event::WindowEvent {
                event: WindowEvent::CloseRequested,
                ..
            } => *control_flow = ControlFlow::Exit,
            Event::WindowEvent {
                event: WindowEvent::KeyboardInput { .. },
                ..
            } => {
                window.set_inner_size(LogicalSize::new(550.0, 550.0));
            }
            _ => (),
        }
    });
}

With your patch, window.set_inner_size() changes the dimensions accordingly, both on initialization and within the event loop when pressing a key.