SidePanel::exact_width does not product a panel of that size

[al2me6]

Describe the bug

Side panels are wider than the given exact_width.

To Reproduce

struct App;

impl eframe::App for App {
    fn update(&mut self, ctx: &eframe::egui::Context, _frame: &mut eframe::Frame) {
        eframe::egui::SidePanel::right("panel")
            .exact_width(150.)
            .show(ctx, |ui| {
                ui.horizontal_wrapped(|ui| {
                    ui.label("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.");
                });
                ui.separator();
            });
    }
}

fn main() -> eframe::Result<()> {
    eframe::run_native(
        "ExactWidth",
        eframe::NativeOptions::default(),
        Box::new(|_cc| Box::new(App)),
    )
}

Expected behavior

The panel is exactly 150 px wide.

Screenshots

Observe that the panel is in fact 166 px wide:

Thus, if the panel is on the right side, UI elements are clipped beyond the window:

Desktop:

• OS: Windows 10
• Browser: Firefox, Chromium-derived
• Version eframe 0.21.3

Additional context
N/A