Ned, about window menus and Mac's single menu: tk and macOS work together to switch the menu to the menu of a window that becomes active. I opened two editor windows and clicked 'Show Code Context' in just one of them. The menu then said 'Hide Code Context'. I clicked the other window and then Option and it said 'Show...'. More experiments clicking windows and toggling CC went well. Show/Hide Line Numbers is intended to work the same way. Since Tal cannot now test, verification would be nice, as well as the line-up check described above