Found it on the internet archive:
https://archive.org/details/wwdc2015videos/718_hd_building_responsive_and_efficient_apps_with_gcd.mp4
crayellow
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I am seeing this same behavior and am unable to find a solution.
Happy to dupe or report -- is there an existing bug number for this?
Steps to duplicate:
super easy because this breaks the front page "Landmarks" tutorial for SwiftUI
jump to Section 3 step 3 of that tutorial: https://developer.apple.com/tutorials/swiftui/building-lists-and-navigation
Expected behavior:
I've attached the (a) dysfunctional and also (b) expected behavior below...