Windows: respect min/max sizes when creating the window (#2393)

Author: amrbashir

CHANGELOG.md

@@ -8,6 +8,8 @@ And please only add new entries to the top of this list, right below the `# Unre
 
 # Unreleased
 
+- On Windows, respect min/max inner sizes when creating the window.
+
 # 0.27.1 (2022-07-30)
 
 - The minimum supported Rust version was lowered to `1.57.0` and now explicitly tested.

src/dpi.rs

@@ -511,6 +511,29 @@ impl Size {
             Size::Logical(size) => size.to_physical(scale_factor),
         }
     }
+
+    pub fn clamp<S: Into<Size>>(input: S, min: S, max: S, scale_factor: f64) -> Size {
+        let (input, min, max) = (
+            input.into().to_physical::<f64>(scale_factor),
+            min.into().to_physical::<f64>(scale_factor),
+            max.into().to_physical::<f64>(scale_factor),
+        );
+
+        let clamp = |input: f64, min: f64, max: f64| {
+            if input < min {
+                min
+            } else if input > max {
+                max
+            } else {
+                input
+            }
+        };
+
+        let width = clamp(input.width, min.width, max.width);
+        let height = clamp(input.height, min.height, max.height);
+
+        PhysicalSize::new(width, height).into()
+    }
 }
 
 impl<P: Pixel> From<PhysicalSize<P>> for Size {

src/platform_impl/windows/window.rs

@@ -879,10 +879,17 @@ impl<'a, T: 'static> InitData<'a, T> {
             win.set_fullscreen(attributes.fullscreen);
             force_window_active(win.window.0);
         } else {
-            let dimensions = attributes
+            let size = attributes
                 .inner_size
                 .unwrap_or_else(|| PhysicalSize::new(800, 600).into());
-            win.set_inner_size(dimensions);
+            let max_size = attributes
+                .max_inner_size
+                .unwrap_or_else(|| PhysicalSize::new(f64::MAX, f64::MAX).into());
+            let min_size = attributes
+                .min_inner_size
+                .unwrap_or_else(|| PhysicalSize::new(0, 0).into());
+            let clamped_size = Size::clamp(size, min_size, max_size, win.scale_factor());
+            win.set_inner_size(clamped_size);
 
             if attributes.maximized {
                 // Need to set MAXIMIZED after setting `inner_size` as