This is odd. This seems to eventually work

  self.edgesForExtendedLayout = UIRectEdge.None
  self.view.superview?.setNeedsUpdateConstraints()
  self.view.superview?.updateConstraintsIfNeeded()

but only after the 2nd call.

So as a work around I am calling it like this:

  self.edgesForExtendedLayout = UIRectEdge.None
  self.view.superview?.setNeedsUpdateConstraints()
  self.view.superview?.updateConstraintsIfNeeded()
  self.view.superview?.setNeedsUpdateConstraints()
  self.view.superview?.updateConstraintsIfNeeded()

I am OK for now (given it's just for testing) but I would love to
understand the "why".
cheers,
Torsten
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