Add concentration on the retainer during the change of bounds

[Savva-Shuliatev]

When the window size changes, the constraint remains static, which makes it difficult to achieve some custom behavior. If it were possible to focus on a point during the change of boundaries via the API, new possibilities could be achieved.

However, it is not obvious what to do if the change of boundaries occurs during the animation, stop it?

[Savva-Shuliatev]

Yea, it is possible, mb will update this code logic:

    if lastViewGeometry != ViewGeometry(of: self) {
      lastViewGeometry = ViewGeometry(of: self)

      anchors = detents.positions.map { detents.y(for: $0) }
      updateCornerRadius()
      updateViewHeight()
      updateViewTopAnchor()
      updateBottomBarAreaHeight()
    }