Resolve "Terminkalender: Dialog des Termin-Exports schließt sich nicht nach Download"

Closes #4094

Merge request studip/studip!2938

app/controllers/calendar/calendar.php

@@ -770,17 +770,30 @@ class Calendar_CalendarController extends AuthenticatedController
                 PageLayout::postError(_('Bitte wählen Sie aus, welche Termine exportiert werden sollen!'));
                 return;
             }
+            $this->relocate($this->url_for('calendar/calendar/export_file', [
+                'begin' => $this->begin->format('d.m.Y'),
+                'end' => $this->end->format('d.m.Y'),
+                'dates_to_export' => $this->dates_to_export
+            ]));
+        }
+    }
+
+    public function export_file_action()
+    {
+        $begin = Request::getDateTime('begin', 'd.m.Y');
+        $end = Request::getDateTime('end', 'd.m.Y');
+        $dates_to_export = Request::option('dates_to_export', 'user');
         $ical = '';
         $calendar_export = new ICalendarExport();
-            if ($this->dates_to_export === 'user') {
-                $ical = $calendar_export->exportCalendarDates(User::findCurrent()->id, $this->begin, $this->end);
-            } elseif ($this->dates_to_export === 'course') {
-                $ical = $calendar_export->exportCourseDates(User::findCurrent()->id, $this->begin, $this->end);
-                $ical .= $calendar_export->exportCourseExDates(User::findCurrent()->id, $this->begin, $this->end);
-            } elseif ($this->dates_to_export === 'all') {
-                $ical = $calendar_export->exportCalendarDates(User::findCurrent()->id, $this->begin, $this->end);
-                $ical .= $calendar_export->exportCourseDates(User::findCurrent()->id, $this->begin, $this->end);
-                $ical .= $calendar_export->exportCourseExDates(User::findCurrent()->id, $this->begin, $this->end);
+        if ($dates_to_export === 'user') {
+            $ical = $calendar_export->exportCalendarDates(User::findCurrent()->id, $begin, $end);
+        } elseif ($dates_to_export === 'course') {
+            $ical = $calendar_export->exportCourseDates(User::findCurrent()->id, $begin, $end);
+            $ical .= $calendar_export->exportCourseExDates(User::findCurrent()->id, $begin, $end);
+        } elseif ($dates_to_export === 'all') {
+            $ical = $calendar_export->exportCalendarDates(User::findCurrent()->id, $begin, $end);
+            $ical .= $calendar_export->exportCourseDates(User::findCurrent()->id, $begin, $end);
+            $ical .= $calendar_export->exportCourseExDates(User::findCurrent()->id, $begin, $end);
         }
         $ical = $calendar_export->writeHeader() . $ical . $calendar_export->writeFooter();
         $this->response->add_header('Content-Type', 'text/calendar;charset=utf-8');
@@ -791,7 +804,6 @@ class Calendar_CalendarController extends AuthenticatedController
         $this->response->add_header('Content-Length', strlen($ical));
         $this->render_text($ical);
     }
-    }
 
     public function import_action() {}
 

app/views/calendar/calendar/export.php

@@ -7,7 +7,7 @@
  * @var DateTimeImmutable $end
  */
 ?>
-<form class="default" method="post"
+<form class="default" method="post" data-dialog="size=auto"
       action="<?= $controller->link_for('calendar/calendar/export', $user_id ?? null) ?>">
     <?= CSRFProtection::tokenTag() ?>
     <fieldset>