Implement PartialOrd/Ord for dpi module types

src/monitor.rs

@@ -32,12 +32,9 @@ impl PartialOrd for VideoMode {
 
 impl Ord for VideoMode {
     fn cmp(&self, other: &VideoMode) -> std::cmp::Ordering {
-        // TODO: we can impl `Ord` for `PhysicalSize` once we switch from `f32`
-        // to `u32` there
-        let size: (u32, u32) = self.size().into();
-        let other_size: (u32, u32) = other.size().into();
         self.monitor().cmp(&other.monitor()).then(
-            size.cmp(&other_size)
+            self.size()
+                .cmp(&other.size())
                 .then(
                     self.refresh_rate_millihertz()
                         .cmp(&other.refresh_rate_millihertz())