5.6.21
When a question was redisplayed from the result screen, a non-functional submit/grading button was displayed, and when the button was clicked on an unanswered question, a message such as "Please answer" was displayed.
Because there was a bug that "Enable" and "Disable" of option value "#hide_list_summary" and "#hide_result_dtail" were set reversely, it was corrected to be hidden when "Enable" was specified.
There was a bug that the correct answer was displayed even if the option value "#show_correct_answer" was set to "Disable", so it has been fixed so that the correct answer will be hidden if it is set to "Disable".
