Issue
Context changes - When the user selects a file in the filepicker the user is not informed that the file edit modal has opened.

Standard Level*
WCAG 2 3.3.2 (A) http://www.w3.org/WAI/WCAG20/quickref/#qr-minimize-error-cues

Impact
Serious

Example Link
http://demo.moodle.net/mod/assign/view.php?id=1778&action=editsubmission

Test Steps

1. Login as a student
2. Navigate to a course
3. Click the assignment
4. Click add...
5. Select recent files/private files (make sure to have a file within the repositories)
6. Click on the file
7. Notice nothing is announced to the screen reader when the file edit modal appears