DragValue panics when min_decimals is set

[YgorSouza]

Describe the bug

Creating a DragValue with min_decimals set to a value greater than 2 without setting max_decimals makes the application panic.

To Reproduce
Steps to reproduce the behavior:

use eframe::egui;

fn main() -> Result<(), eframe::Error> {
    eframe::run_native(
        "My egui App",
        Default::default(),
        Box::new(|_cc| Box::<MyApp>::default()),
    )
}

#[derive(Default)]
struct MyApp {
    value: f64,
}

impl eframe::App for MyApp {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        egui::CentralPanel::default().show(ctx, |ui| {
            ui.add(egui::DragValue::new(&mut self.value).min_decimals(3));
        });
    }
}

Expected behavior

The documentation does not say this is not allowed, so it should not panic.

Additional context

• This is the code that causes the panic:

egui/crates/egui/src/widgets/drag_value.rs

Lines 393 to 396 in 860dac6

	let auto_decimals = (aim_rad / speed.abs()).log10().ceil().clamp(0.0, 15.0) as usize;
	let auto_decimals = auto_decimals + is_slow_speed as usize;
	let max_decimals = max_decimals.unwrap_or(auto_decimals + 2);
	let auto_decimals = auto_decimals.clamp(min_decimals, max_decimals);

• It also panics if you set max_decimals less than min_decimals, which is somewhat expected, but also not documented. We could just use at_least and at_most to decide a priority between the two and solve both problems at once.