Number fields take a decimal comma too (#1347) (#1418)

A number field reads "2,5" as 2.5, as a numeric keypad types it in many locales; a comma beside a point or a second comma is not guessed at.

crates/ui-egui/src/dim_view.rs

@@ -408,7 +408,7 @@ pub fn label(k: &ConstraintKind, expr: Option<&str>, driven: bool, units: &str,
     let plain = expr.is_none_or(|e| {
         let e = e.trim();
         let e = ["mm", "cm", "in", "ft", "m", "deg", "rad", "°"].iter().find_map(|unit| e.strip_suffix(unit)).unwrap_or(e);
-        e.trim().parse::<f64>().is_ok()
+        crate::prefs::parse_number(e).is_some()
     });
     let text = if plain { num } else { format!("fx: {num}") };
     if driven { format!("({text})") } else { text }
@@ -823,6 +823,8 @@ mod tests {
         let k = ConstraintKind::Length { l: 0, value: 25.0 };
         assert_eq!(label(&k, Some("25 mm"), false, "mm", 2), "25.00");
         assert_eq!(label(&k, Some("width * 2"), false, "mm", 2), "fx: 25.00");
+        // A value typed with a decimal comma is a plain value too (#1347).
+        assert_eq!(label(&ConstraintKind::Length { l: 0, value: 25.5 }, Some("25,5 mm"), false, "mm", 2), "25.50");
         assert_eq!(label(&k, None, true, "mm", 2), "(25.00)");
         assert_eq!(label(&ConstraintKind::Radius { c: 0, value: 5.0 }, Some("5 mm"), false, "mm", 2), "R5.00");
         assert_eq!(label(&ConstraintKind::Diameter { c: 0, value: 10.0 }, Some("10"), false, "mm", 2), "Ø10.00");