NSPopover.Behavior.semitransient
The system will close the popover when the user interacts with user interface elements in the window containing the popover’s positioning view.
Declaration
case semitransientDiscussion
Semi-transient popovers cannot be shown relative to views in other popovers, nor can they be shown relative to views in child windows. The exact interactions that cause semi-transient popovers to close are not specified.