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Re:macOS lock screen: “I just sent my session pass to my who... by linkregister on Friday December 08, 2017 @05:59PM (#15882868)
Yes, stealing focus by another application should not be permitted by the window manager / OS. Windows XP had a feature or a 3rd party plugin that would simply blink the application in the task bar if it attempted to steal focus. I also seem to remember a similar feature in Gnome 2, though it could be a false memory.
Re:macOS lock screen: “I just sent my session pass to my who... by lostlogin on Saturday December 09, 2017 @03:32PM (#15887943)
I remember this (I think). The worst offenders that come to mind for me are applications themselves, not other programs or the OS.

Edit: a possible exception being the “please enter your iCloud password” curse I somehow cast on myself sometimes.