App shows a blank window on start

[ghostman2013]

Description
I copied a code from an example: Hello, World!.
It's a total duplicate, project dependencies below:

[dependencies]
copypasta = "0.10.0"
glium = { version = "0.32.1", default-features = true }
imgui = { version = "0.11.0", features = ["freetype"] }
imgui-glium-renderer = "0.11.0"
imgui-winit-support = "0.11.0"
# Pin indirect dependency scoped-tls to 1.0.0
# as 1.0.1 bumped MSRV to 1.59
# Used only in
# imgui-examples -> glium -> glutin -> wayland-client -> scoped-tls
# so not worth bumping MSRV for this basically to keep CI happy
# FIXME: Remove this for imgui-rs v0.10 and bump MSRV
scoped-tls = "=1.0.0"

However, when I launch app it shows a blank window. If I resize the window at least a bit GUI begins showing well.

I have also tried to move a mouse pointer over this blank window and... It works! I mean the mouse cursor is changed like there are GUI controls under it. Everything works just invisible until you won't resize the window.

To Reproduce

1. Run app
2. Watch a blank window =)

Expected behavior

1. Run app
2. Watch an awesome ImGUI

Screenshots
Before resizing

After resizing

Please describe your environment
I use macOS (M1 Pro, Sonoma 14.2), rustc 1.75.0-nightly (a2f5f9691 2023-11-02)

Other information
If it's required I will provide any additional details about this bug

[EinarsNG]

There is a workout i found. It involves tinkering with the support/mod.rs file. Not sure if it's the best solution but it seems to work for me.
At the start of this

imgui-rs/imgui-examples/examples/support/mod.rs

Lines 139 to 157 in 8b2722d

	Event::RedrawRequested(_) => {
	let ui = imgui.frame();
	let mut run = true;
	run_ui(&mut run, ui);
	if !run {
	*control_flow = ControlFlow::Exit;
	}
	let gl_window = display.gl_window();
	let mut target = display.draw();
	target.clear_color_srgb(1.0, 1.0, 1.0, 1.0);
	platform.prepare_render(ui, gl_window.window());
	let draw_data = imgui.render();
	renderer
	.render(&mut target, draw_data)
	.expect("Rendering failed");
	target.finish().expect("Failed to swap buffers");
	}

match statement you can insert something like:

if last_frame.duration_since(first_frame).as_millis() > 100 {
    once_flag.call_once(|| {
        let gl_window = display.gl_window();
        let resize_window_event: Event<WindowEvent> = Event::WindowEvent {
            event: WindowEvent::Resized(gl_window.window().inner_size()),
            window_id: gl_window.window().id(),
        };
        platform.handle_event(
            imgui.io_mut(),
            gl_window.window(),
            &resize_window_event
        );
    });
}

Which will trigger a Resized event down the rendering pipeline 100ms after the window has started rendering.
you assign first_frame and once_flag before the event_loop.run.