Window::default_pos does not work

[zhatuokun]

Describe the bug

I want a Window to be created at the right bottom corner and then be resizable and movable. I tried using default_pos but it didn't work. fixed_pos works, but then I can't move the window afterwards.

To Reproduce

run this code

    eframe::run_simple_native("Example", eframe::NativeOptions::default(), |ctx, frame| {
        CentralPanel::default().show(ctx, |ui| {
            let window_size = Vec2::new(200.0, 200.0);

            Window::new("example")
                .pivot(Align2::LEFT_TOP)
                .min_size(window_size)
                .default_size(window_size)
                .default_pos(ui.max_rect().right_bottom() - window_size)
                .show(ctx, |ui| {
                    ui.expand_to_include_rect(ui.available_rect_before_wrap());
                    ui.label("text");
                });
        });
    })

Expected behavior

Create a Window at the right bottom corner and then be resizable and movable.

Desktop (please complete the following information):

• OS: Window11
• Version: 23H2