Visual glitch on non-translucent navigation bar for Detail Screen in Split View

Originator:paolo
Number:rdar://34811066 Date Originated:4 October 2017
Status:Open Resolved:
Product:iOS + SDK Product Version:11.0
Classification:UIKit Reproducible:Always
 
Summary:
In a standard Master-Detail app, if the navigation bar of the Detail Screen is set to non-translucent, a landscape orientation on a Compact device (iPhone 5x, iPhone 6x, iPhone 7 & 8) leaves a grey strip between the bar and the view.
See attached screenshot

Steps to Reproduce:
- Create a standard new Master-Detail app in Xcode (sample attached)
- Without touching any code, open the Main.storyboard
- For the 2 UINavigationController scenes, select the navigation bar and uncheck the Translucent option
- Run the app on an iOS 11 Simulator for a Compact device (for example, iPhone 8)
- Create an entry, and select it to enter the Detail screen
- Switch to landscape

Expected Results:
There's no discontinuity between the navigation bar and the controller's view

Actual Results:
There's a 12 pixel high grey strip

Version/Build:
iOS 11.0

Configuration:
Simulator
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