Fixed bug where teachers could not download corrupted groups submissions.

views/downloadsubmission.php

@@ -59,7 +59,8 @@ if (! $subinstance) {
 if ($subinstance->vpl != $vpl->get_instance()->id) {
     throw new moodle_exception( 'vpl submission vpl inconsistence' );
 }
-if ($vpl->is_inconsistent_user( $subinstance->userid, $userid )) {
+if ($vpl->is_inconsistent_user( $subinstance->userid, $userid ) && !$vpl->has_capability( VPL_GRADE_CAPABILITY )) {
+    // A student can't download another student/group's submission.
     throw new moodle_exception( 'nopermissions', null, null, get_string('download') );
 }
 $submission = new mod_vpl_submission( $vpl, $subinstance );