title: SwiftUI: Automatic preview updating paused, always
body: <p>I have an existing App, basically a shopping list app, to which I'm trying to add some sweet sweet SwiftUI lovin.</p>
  
  <p>My issue is the real time preview updating doesn't work - the warning "Automatic preview updating paused" continually shows. I hit the resume button, it builds the app, it shows the current view, and that warning immediately shows again. I can never see changes to the code reflected in the canvas without using the resume button.</p>
  
  <p>This is happening in Xcode 11.1, and 11.2 beta 2. I can find literally no other mention of this either here on SO, and there's one thread with no answers on Apple's Dev forums.</p>