f 'Update winit 0.28 -> 0.29'

Only forward keyboard events on initial key press.

src/winit_event_loop.rs

@@ -384,7 +384,7 @@ where
  _ => None,
  };
 
- if let Some(key) = key {
+ if let (Some(key), true) = (key, key_event.state == ElementState::Pressed) {
  self.cx.process(&self.view, &Event::Key(key))
  }
  }