Use the minus character instead of "dash" (#3271)

* Use the minus character instead of "dash"

See rerun-io/rerun#3053

* docstring

* fix

Author: emilk

crates/egui/src/data/input.rs

@@ -788,7 +788,7 @@ impl Key {
             Key::ArrowLeft => "⏴",
             Key::ArrowRight => "⏵",
             Key::ArrowUp => "⏶",
-            Key::Minus => "-",
+            Key::Minus => crate::MINUS_CHAR_STR,
             Key::PlusEquals => "+",
             _ => self.name(),
         }

crates/egui/src/lib.rs

@@ -25,7 +25,7 @@
 //! fn ui_counter(ui: &mut egui::Ui, counter: &mut i32) {
 //!     // Put the buttons and label on the same row:
 //!     ui.horizontal(|ui| {
-//!         if ui.button("-").clicked() {
+//!         if ui.button("−").clicked() {
 //!             *counter -= 1;
 //!         }
 //!         ui.label(counter.to_string());
@@ -467,6 +467,9 @@ macro_rules! egui_assert {
 
 // ----------------------------------------------------------------------------
 
+/// The minus character: <https://www.compart.com/en/unicode/U+2212>
+pub(crate) const MINUS_CHAR_STR: &str = "−";
+
 /// The default egui fonts supports around 1216 emojis in total.
 /// Here are some of the most useful:
 /// ∞⊗⎗⎘⎙⏏⏴⏵⏶⏷

crates/egui/src/widgets/drag_value.rs

@@ -271,7 +271,7 @@ impl<'a> DragValue<'a> {
             self.custom_formatter(move |n, _| format!("{:0>min_width$b}", n as i64))
         } else {
             self.custom_formatter(move |n, _| {
-                let sign = if n < 0.0 { "-" } else { "" };
+                let sign = if n < 0.0 { MINUS_CHAR_STR } else { "" };
                 format!("{sign}{:0>min_width$b}", n.abs() as i64)
             })
         }
@@ -306,7 +306,7 @@ impl<'a> DragValue<'a> {
             self.custom_formatter(move |n, _| format!("{:0>min_width$o}", n as i64))
         } else {
             self.custom_formatter(move |n, _| {
-                let sign = if n < 0.0 { "-" } else { "" };
+                let sign = if n < 0.0 { MINUS_CHAR_STR } else { "" };
                 format!("{sign}{:0>min_width$o}", n.abs() as i64)
             })
         }
@@ -345,11 +345,11 @@ impl<'a> DragValue<'a> {
                 self.custom_formatter(move |n, _| format!("{:0>min_width$x}", n as i64))
             }
             (false, true) => self.custom_formatter(move |n, _| {
-                let sign = if n < 0.0 { "-" } else { "" };
+                let sign = if n < 0.0 { MINUS_CHAR_STR } else { "" };
                 format!("{sign}{:0>min_width$X}", n.abs() as i64)
             }),
             (false, false) => self.custom_formatter(move |n, _| {
-                let sign = if n < 0.0 { "-" } else { "" };
+                let sign = if n < 0.0 { MINUS_CHAR_STR } else { "" };
                 format!("{sign}{:0>min_width$x}", n.abs() as i64)
             }),
         }

crates/egui/src/widgets/slider.rs

@@ -395,7 +395,7 @@ impl<'a> Slider<'a> {
             self.custom_formatter(move |n, _| format!("{:0>min_width$b}", n as i64))
         } else {
             self.custom_formatter(move |n, _| {
-                let sign = if n < 0.0 { "-" } else { "" };
+                let sign = if n < 0.0 { MINUS_CHAR_STR } else { "" };
                 format!("{sign}{:0>min_width$b}", n.abs() as i64)
             })
         }
@@ -430,7 +430,7 @@ impl<'a> Slider<'a> {
             self.custom_formatter(move |n, _| format!("{:0>min_width$o}", n as i64))
         } else {
             self.custom_formatter(move |n, _| {
-                let sign = if n < 0.0 { "-" } else { "" };
+                let sign = if n < 0.0 { MINUS_CHAR_STR } else { "" };
                 format!("{sign}{:0>min_width$o}", n.abs() as i64)
             })
         }
@@ -469,11 +469,11 @@ impl<'a> Slider<'a> {
                 self.custom_formatter(move |n, _| format!("{:0>min_width$x}", n as i64))
             }
             (false, true) => self.custom_formatter(move |n, _| {
-                let sign = if n < 0.0 { "-" } else { "" };
+                let sign = if n < 0.0 { MINUS_CHAR_STR } else { "" };
                 format!("{sign}{:0>min_width$X}", n.abs() as i64)
             }),
             (false, false) => self.custom_formatter(move |n, _| {
-                let sign = if n < 0.0 { "-" } else { "" };
+                let sign = if n < 0.0 { MINUS_CHAR_STR } else { "" };
                 format!("{sign}{:0>min_width$x}", n.abs() as i64)
             }),
         }