The new help file for "Show hidden items" in 2.0. is contradicting the functionality: http://qa.moodle.net/help.php?component=grades&identifier=showhiddenitems&lang=en
Functionality (in 1.9. and 2.0):
No hidden - if chosen then NO hidden items will be shown to students
All hidden - if chosen, then all hidden items/columns WILL be shown (with the actual grades hidden)
New 2.0 helpfile, however, says:
No hidden - Hidden grade item row is shown in grey with the grade hidden completely
All hidden - Grade items are completely hidden
I propose a change in wording for language strings "All hidden" and "No hidden", since they are confusing by themselves, imho, and then editing the helpfile.
"All hidden" can be renamed into "Yes, show hidden items"
"No hidden" can be renamed into "No, do not show"
Helpfile can state:
No, do not show - Grade items are completely hidden
Only hidden until - Grade items with a "hide until" date set are shown in grey with the grades hidden completely until the set date, after which the whole item is shown
Yes, show hidden items - Hidden grade item row is shown in grey with the grade hidden completely