Yes, BBEdit on the Mac has always done that, too. I often open a new tab and paste something in there to keep it around for some indeterminate time. BBEdit save

Yes, BBEdit on the Mac has always done that, too. I often open a new tab and paste something in there to keep it around for some indeterminate time. BBEdit saves the temp content until I decide to close the tab or to formally save it and give it a name. It does that even when closing the app or rebooting.