Allow clipboard access in Widget::on_event

winit/src/clipboard.rs

@@ -0,0 +1,13 @@
+pub struct Clipboard(window_clipboard::Clipboard);
+
+impl Clipboard {
+    pub fn new(window: &winit::window::Window) -> Option<Clipboard> {
+        window_clipboard::Clipboard::new(window).map(Clipboard).ok()
+    }
+}
+
+impl iced_native::Clipboard for Clipboard {
+    fn content(&self) -> Option<String> {
+        self.0.read().ok()
+    }
+}