Feature #1742 - Gradebook: Fixing PDF-export to accept the "Landscape" page orientation. This should be done due to a change within the mPDF class.

main/gradebook/gradebook_flatview.php

@@ -191,7 +191,8 @@ if (isset ($_GET['exportpdf']))	{
 		$subject_pdf = api_utf8_encode(get_lang('FlatView'));
 		$keywods_pdf = api_utf8_encode($course_code);
 
-		$pdf = new mPDF('UTF-8', 'A4', '', '', 32, 25, 27, 25, 16, 13, $export['orientation']);
+		$page_format = $export['orientation'] == 'landscape' ? 'A4-L' : 'A4';
+		$pdf = new mPDF('UTF-8', $page_format, '', '', 32, 25, 27, 25, 16, 13, $export['orientation']);
 		$pdf->directionality = api_get_text_direction();
 		$pdf->useOnlyCoreFonts = true;