UIStackView calculates really wrong height value

Originator:hotngui
Number:rdar://28151124 Date Originated:9/3/2016
Status:Open Resolved:
Product:Xcode Product Version:7.3.1 (8 beta 6)
Classification:Serious Bug Reproducible:Yes
 
Summary:
If you add a couple of UILabel instances into a vertically oriented UIStackView IB calculates the wrong value for the height of it - which in turns leads to warnings that cannot be cleared and more importantly makes it impossible to properly layout the rest of the scene.

Steps to Reproduce:
1. Uncompress that attached file
2. Open the "Main.storyboard"
3. Observe the warnings and improper layout of the UIStackView instances in both scenes (UIViewController, UITableViewController)

Expected Results:
I expect the layout to be calculated correctly on the screen, so I can continue the layout of the rest of my scene.

Actual Results:
According to the warning messages the UIStackView wants to have a huge height >400 even though there are are two small UILabel instances contained within the UIStackView instances.

Version:
Xcode 7.3.1
Xcode 8 Beta 6

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