Missing diagram indication of user selection before selecting "Fit to screen"

[lmcbout]

Diagram -> Fit-to-screen : Seems the command does different things depending where the last user focus selection was in the diagram. Sometimes, we seem the whole diagram, sometimes, we see only one box within the diagram. It looks like depending the last time you click on the diagram, it enlarge this section of the diagram to fit the screen, but there is no indicator in the diagram showing what is being "selected"