message: Simplify `cursor_to_center` in `image::Viewer`
diff: @@ -149,23 +149,6 @@ impl<'a> Viewer<'a> {
  }
  }
  -/// Cursor position relative to the [`Viewer`] bounds.
  -///
  -/// [`Viewer`]: struct.Viewer.html
  -fn relative_cursor_position(
  - absolute_position: Point,
  - bounds: Rectangle,
  -) -> Point {
  - absolute_position - Vector::new(bounds.x, bounds.y)
  -}
  -
  -/// Center point relative to the [`Viewer`] bounds.
  -///
  -/// [`Viewer`]: struct.Viewer.html
  -fn relative_center(bounds: Rectangle) -> Point {
  - bounds.center() - Vector::new(bounds.x, bounds.y)
  -}
  -
  impl<'a, Message, Renderer> Widget<Message, Renderer> for Viewer<'a>
  where
  Renderer: self::Renderer + image::Renderer,
  @@ -241,10 +224,8 @@ where
  let factor =
  self.state.scale / previous_scale - 1.0;
  - let cursor_to_center = relative_cursor_position(
  - cursor_position,
  - bounds,
  - ) - relative_center(bounds);
  + let cursor_to_center =
  + cursor_position - bounds.center();
  let adjustment = cursor_to_center * factor
  + self.state.current_offset * factor;
  