metadata: Properly display exposure times > 0.5s

Closes #349

NEWS

@@ -2,6 +2,7 @@
 ====
 
 - Fix fractional scaling beeing blury by setting GDK_DEBUG=gl-no-fractional as default
+- Fix exposure times above 0.5 seconds not being displayed correctly in properties
 
 46.1
 ====

src/metadata/mod.rs

@@ -254,10 +254,21 @@ impl Metadata {
         if let Some(exif) = &self.exif {
             let field = exif.get_field(exif::Tag::ExposureTime, exif::In::PRIMARY)?;
             if let exif::Value::Rational(rational) = &field.value {
-                let exposure = format!("{:.0}", 1. / rational.first()?.to_f32());
+                let speed = rational.first()?.to_f32();
 
-                // Translators: Unit for exposure time in seconds
+                if speed <= 0.5 {
+                    let exposure = format!("{:.0}", 1. / speed);
+                    // Translators: Fractional exposure time (photography) in seconds
                     return Some(gettext_f("1\u{2215}{}\u{202F}s", [exposure]));
+                } else {
+                    let exposure = if speed < 5. {
+                        format!("{:.1}", speed)
+                    } else {
+                        format!("{:.0}", speed)
+                    };
+                    // Translators: Exposure time (photography) in seconds
+                    return Some(gettext_f("{}\u{202F}s", [exposure]));
+                }
             }
         }
 

src/widgets/drag_overlay.rs

@@ -25,9 +25,10 @@ use adw::prelude::*;
 use crate::deps::*;
 
 mod imp {
+    use std::cell::OnceCell;
+
     use adw::subclass::prelude::*;
     use glib::{ParamSpec, Properties, Value};
-    use std::cell::OnceCell;
 
     use super::*;