Chamilo LMS

This is minor as a student isn't supposed to be taking several tests at the same time, but I'm registering it in order to find a patch at some point.

The original task for this was #5272, which required the implementation of a mechanism to block the global chat while a student is taking an exam.
It was implemented using $_SESSION[current_exercises] => Array ( [8] => [10] => 1 [11] => [12] => ) as a form of storing the different "ongoing" attempts at exercises. If one of the current_exercises elements has a value of 1, then it is assumed the student is still taking an exam and cannot chat yet.

I managed to get to the [current_exercises] => Array ( [8] => [10] => 1 [11] => [12] => ) situation while having finished all my exams this way:

• created exam 1 in course AAA
• created exam 1 in course BBB
• registered student to both courses AAA and BBB
• The student opens 2 tabs, one in course AAA, and starts exam 1, one in course BBB, and starts exam 1 there too
• The student finishes exam AAA.1
• The student then goes out of BBB.1 before finishing (he clicks somewhere on the breadcrumb) and comes back to the exam BBB.1
• The student finishes exam BBB.1
• The student has now finished both exams, but the chat is still not available. [current_exercises] => Array ( [8] => [10] => 1 [11] => [12] => ) indicates that there was an unfinished attempt and, when re-entering the exercise, it was considered as a new attempt (not the same one)