Window::clone fix

CHANGELOG.md

@@ -20,6 +20,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   and `RunningWindow::outer_position`. `RunningWindow::set_position` has been
   renamed to `RunningWindow::set_outer_position`.
 
+### Fixed
+
+- `Window`'s `Clone` implementation no longer requires its generic parameter to
+  implement `Clone`.
+
 ### Added
 
 - `PendingApp::on_startup` accepts a callback that will be invoked once the

src/window.rs

@@ -22,7 +22,7 @@ use crate::{
 };
 
 /// A weak reference to a running window.
-#[derive(Debug, Clone)]
+#[derive(Debug)]
 pub struct Window<Message> {
     opened: OpenedWindow,
     sender: Weak<mpsc::SyncSender<WindowMessage<Message>>>,
@@ -61,6 +61,15 @@ impl<Message> Window<Message> {
     }
 }
 
+impl<Message> Clone for Window<Message> {
+    fn clone(&self) -> Self {
+        Self {
+            opened: self.opened.clone(),
+            sender: self.sender.clone(),
+        }
+    }
+}
+
 /// A builder for a window.
 ///
 /// This type is similar to winit's