I am referring to the macro that can be assigned to a shortcut key in the “Keyboard” tab of the “Properties…” menus. (I assigned it to the ALT-M key combination. It is very handy to toggle marks when you suspect that an invisible character messes up your code.)
This “Marks” menu item (as opposed to the “Marks” tab in the “Properties…” menu panes) only applies to the top three marks: “Return”, “End-of-file” and “Tabs”.
IMHO, I think that it should toggle ALL PREVIOUSLY SELECTED marks choices, namely those selected using the View -> Marks menu or by using the Tools -> Properties… -> Marks tab.
In short, using my ALT-M keyboard shortcut, I could switch-on and switch-off all marks I previously selected in either of the above two paths.