Allow for pointerEvents to be fired close the header #37
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I've experienced that none of my pointerEvents are firing close to my fixed header after the Parallax foreground had been collapsed. When using the inspector I found that the entire parallaxHeight was still assigned to the wrapperView of the foreground, causing it to render an invisible view on top of my scrollable component (in this case a Webview) which then blocks all click events in my webview under that area.
Here is an image depicting the problem (the highlighted area is unclickable):

The PR includes minor changes to the height of the view to match the height of the collapsed header(headerHeight in props) when the parallax is collapsed after scrolling down.