method

We set this prop to default value here to workaround view-recycling.
Let's assume the view has had _stackPresentation == <some modal stack presentation> set
before below line was executed. Then, when instantiated again (with the same modal presentation)
updateProps:oldProps: method would be called and setter for stack presentation would not be called.
This is crucial as in that setter we register `self` as a delegate (UIAdaptivePresentationControllerDelegate) to
presentation controller and this leads to buggy modal behaviour as we rely on
UIAdaptivePresentationControllerDelegate callbacks. Restoring the default value and then comparing against it in
updateProps:oldProps: allows for setter to be called, however if there was some additional logic to execute when
stackPresentation is set to "push" the setter would not be triggered.

…te, not

second-to-last props.