this line      usableHeight = NSMenu.menuBarVisible() ? totalHeight - 23 : totalHeight      uses ternary operator ; is a condensed form of it then else.  It is equivalent to:     if NSMenu.menuBarVisible() { usableHeight = totalHeight - 23 } else { usableHeight = totalHeight }. Swift programming language explains « The ternary conditional operator is a special operator with three parts, which takes the form question ? answer1 : answer2. It is a shortcut for evaluating one of two expressions based on whether question is true or false. If question is true, it evaluates answer1 and returns its value; otherwise, it evaluates answer2 and returns its value. ». It is very convenient when you have to set a value depending on condition. For instance let color = (score < 10) ? UIColor.red : UIColor.green

It's working, but with some glitches: no message sent occasionally.

That's exactly what the doc states: group must come from another module.    need to be in different modules to allow lowerThan

Thanks for the answer. It would be useful to have this mentioned in documentation.

Sure, you have to change the value of firstPass to false once you have fired the first link.

Sure, I did not propose this as a solution, just a test. And what happens if you scroll beyond the bottom of the scrollView ? In any case, thanks to feedback if you get answer to the FB report.

What happens if the scrollView does not go up to the top but leaves some space to catch and drag ?

Good news. It is working again now. Thanks.

And if you want to keep the new position, use Update Constraint Constants.

Was it after installing a beta version of iOS ? In anycase, you should contact Apple support. See here: https://support.apple.com/en-au/HT201263

Or create a Bool true or false depending on $segmentNumber

Please tell exactly where you stand now: are the favorites saved corectly ? What are all print output you get when you restart the app ? ANd provide more precise output with          print("There are favourites", prefArr.count)

I would not devlop this (and probably many more features) on SwiftUI today.

You welcome. Tell us what you did, and then close the thread. Wish you good continuation.

I should have thought of it earlier: composition of x axis 180° and y axis 180° is z axis 180°, what I was looking for.