[dave-atx]

On an unfolded iPhone Duo the article fills a 669pt-wide expanded split view, and swiping in from the left edge to get the timeline back does nothing. The same swipe works if it starts alongside the top or bottom toolbar.

The article is a UIPageViewController, and a no-op pan recognizer on its internal scroll view refuses simultaneous recognition within 40pt of the left edge, so an edge swipe doesn't page back and navigate back at the same time. The refusal is unconditional:

let point = gestureRecognizer.location(in: nil)
if point.x > 40 {
    return true
}
return false

Every recognizer competing for that strip gets turned away, the split view's reveal gesture included. Beside the toolbars the page view controller isn't under the touch, nothing refuses, and the reveal works.

This narrows the refusal to the one recognizer it was aimed at:

guard otherGestureRecognizer === pageViewController.scrollViewInsidePageControl?.panGestureRecognizer else {
    return true
}
return gestureRecognizer.location(in: nil).x > 40

Paging is still held back near the edge, so the original behavior is intact. Everything else gets the touch, which leaves presentsWithGesture to do the reveal and leaves the collapsed case to the navigation controller's pop.

Verified on an unfolded iPhone Duo running iOS 27.1. It isn't Duo-specific, though — any expanded split view showing the article by itself runs into it. Related to #5427.