The nearest ancestor scroll view that contains the current view.
If the current view is not embedded inside a scroll view, the value of this property is
nil. This property does not contain the current view if the current view is itself a scroll view. It always contains an ancestor scroll view.
Scrolls the view’s closest ancestor
NSClipView object so a point in the view lies at the origin of the clip view's bounds rectangle.
func scroll(NSRect, by: NSSize)
Copies the visible portion of the view’s rendered image within a region and lays that portion down again at a specified offset .
Notifies a clip view’s superview that either the clip view’s bounds rectangle or the document view’s frame rectangle has changed, and that any indicators of the scroll position need to be adjusted.