Slider, by default clamp to range (#789)

* Slider, by default clamp to range

* Update change log.

CHANGELOG.md

@@ -26,6 +26,7 @@ NOTE: [`epaint`](epaint/CHANGELOG.md), [`eframe`](eframe/CHANGELOG.md), [`egui_w
 * By default, `DragValue`:s no longer show a tooltip when hovered. Change with `Style::explanation_tooltips`.
 * Smaller and nicer color picker.
 * `ScrollArea` will auto-shrink to content size unless told otherwise using `ScollArea::auto_shrink`.
+* By default, `Slider`'s `clamp_to_range` is set to true.
 
 ### Fixed 🐛
 * Fix wrongly sized multiline `TextEdit` in justified layouts.

egui/src/widgets/slider.rs

@@ -95,7 +95,7 @@ impl<'a> Slider<'a> {
                 smallest_positive: 1e-6,
                 largest_finite: f64::INFINITY,
             },
-            clamp_to_range: false,
+            clamp_to_range: true,
             smart_aim: true,
             show_value: true,
             prefix: Default::default(),
@@ -163,7 +163,7 @@ impl<'a> Slider<'a> {
     }
 
     /// If set to `true`, all incoming and outgoing values will be clamped to the slider range.
-    /// Default: `false`.
+    /// Default: `true`.
     pub fn clamp_to_range(mut self, clamp_to_range: bool) -> Self {
         self.clamp_to_range = clamp_to_range;
         self