Fix: egui::Window size recognition issue

[rustbasic]

Fix : egui::Window size recognition issue

This is completed. Removed another commit.

• Related Auto sized Window does not get updated when app window is resized larger  #4300
• Closes Window contents can sometimes be affected by mouse interaction outside the window #4349
• Related [Web Rendering Bug]: Unexpected Height Event Setter Behavior on Mouse Move when Integrating Yew with Egui #4407

It will be easier to check the problem using the example below.

struct TestApp;

impl eframe::App for TestApp {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        egui::Window::new("test")
            .scroll(true)
            .resizable(true)
            .show(ctx, |ui| {
                ui.label("looooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong");
                ui.collapsing(
                    "looooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong",
                    |_ui| {},
                );
            });

        egui::CentralPanel::default().show(ctx, |ui| {
            ctx.options_mut(|options| {
                options.tessellation_options.debug_paint_clip_rects = true;
            });
            ctx.settings_ui(ui);
        });
    }
}

fn main() {
    let _result = eframe::run_native(
        "Test",
        Default::default(),
        Box::new(|_cc| Box::new(TestApp)),
    );
}

[rustbasic]

Fix 1: egui::Window size recognition issue
The biggest problem (bug) solution is saving state.

[s-nie]

Thanks for taking a shot at this. I tried it and it does fix the issue.

However, the fix seems to have had some unintended side effects. For example, when increasing the size of a window, its contents will always be scaled to the maximum size that the window had at any point. On the master branch, they would take up less space again as the window is made smaller.

[rustbasic]

This is completed. Removed another commit.