This is kinda an edge case? Might be considered a bug. This is specific logic to cover a case where there is a back action and a split view controller which is a fairly rare configuration. We likely forgot about this specific detail when accounting for this configuration. The goal is to ensure that developers don't accidentally prevent access to the primary column of the split view controller, since normally the back action would handle that.
Topic:
UI Frameworks
SubTopic:
UIKit
Tags: