message: Implement `Widget::mouse_interaction` for `Canvas` in `iced_graphics`
diff: @@ -7,6 +7,7 @@ use crate::renderer::{self, Renderer};
  use crate::{Backend, Primitive};
  use iced_native::layout;
  +use iced_native::mouse;
  use iced_native::{
  Clipboard, Element, Hasher, Layout, Length, Point, Rectangle, Size, Vector,
  Widget,
  @@ -187,6 +188,18 @@ where
  event::Status::Ignored
  }
  + fn mouse_interaction(
  + &self,
  + layout: Layout<'_>,
  + _viewport: &Rectangle,
  + cursor_position: Point,
  + ) -> mouse::Interaction {
  + let bounds = layout.bounds();
  + let cursor = Cursor::from_window_position(cursor_position);
  +
  + self.program.mouse_interaction(bounds, cursor)
  + }
  +
  fn draw(
  &self,
  renderer: &mut Renderer<B>,
  