Visual Clue for Open Project in Unsaved State (macOS)

[GordW]

When using many other Mac apps there is a small visual clue in the top left corner of the app to show that the open file is in an unsaved state. When the open file has been edited but not yet saved, there is a black dot in the middle of the "Close" jellybean (see image). Once the file is saved, the jellybean turns to solid red. I've become used to seeing this visual clue to quickly determine if the open file needs to be saved. I suspect this small suggestion likely requires many hours of coding to implement.