If there are collapsed cells with the "Exercise" extension (1 or 2, is the same) within collapsed cells with the "Collapsible Headings" extension, if the latter is expanded, the previous one is also expanded and I have to press twice on the slider/[+] to re-hide the exercise.
If there are collapsed cells with the "Exercise" extension (1 or 2, is the same) within collapsed cells with the "Collapsible Headings" extension, if the latter is expanded, the previous one is also expanded and I have to press twice on the slider/[+] to re-hide the exercise.