Fix #340 Check duration of session when checking if a student enrolled before a session.

renderer.php

@@ -1101,7 +1101,7 @@ class mod_attendance_renderer extends plugin_renderer_base {
                 $row->cells[] = format_float($status->grade, 1, true, true) . ' / ' .
                                     format_float($statussetmaxpoints[$status->setnumber], 1, true, true);
                 $row->cells[] = $sess->remarks;
-            } else if ($sess->sessdate < $userdata->user->enrolmentstart) {
+            } else if (($sess->sessdate + $sess->duration) < $userdata->user->enrolmentstart) {
                 $cell = new html_table_cell(get_string('enrolmentstart', 'attendance',
                                             userdate($userdata->user->enrolmentstart, '%d.%m.%Y')));
                 $cell->colspan = 3;

renderhelpers.php

@@ -74,7 +74,7 @@ class user_sessions_cells_generator {
                     $this->construct_remarks_cell($this->reportdata->sessionslog[$this->user->id][$sess->id]->remarks);
                 }
             } else {
-                if ($this->user->enrolmentstart > $sess->sessdate) {
+                if ($this->user->enrolmentstart > ($sess->sessdate + $sess->duration)) {
                     $starttext = get_string('enrolmentstart', 'attendance', userdate($this->user->enrolmentstart, '%d.%m.%Y'));
                     $this->construct_enrolments_info_cell($starttext);
                 } else if ($this->user->enrolmentend and $this->user->enrolmentend < $sess->sessdate) {