MDL-30249 Display warning when downloading/uploading a file

blocks/community/communitycourse.php

@@ -110,6 +110,9 @@ if ($usercandownload and $download != -1 and !empty($downloadcourseid) and confi
     $sizeinfo->total = number_format($backupsize / 1000000, 2);
     echo html_writer::tag('div', get_string('downloadingsize', 'block_community', $sizeinfo),
             array('class' => 'textinfo'));
+    if (ob_get_level()) {
+        ob_flush();
+    }
     flush();
     $filenames = $communitymanager->block_community_download_course_backup($course);
     echo html_writer::tag('div', get_string('downloaded', 'block_community'),

course/publish/backup.php

@@ -100,6 +100,9 @@ echo $OUTPUT->header();
 echo $OUTPUT->heading(get_string('sendingcourse', 'hub'), 3, 'main');
 $renderer = $PAGE->get_renderer('core', 'publish');
 echo $renderer->sendingbackupinfo($backupfile);
+if (ob_get_level()) {
+    ob_flush();
+}
 flush();
 
 //send backup file to the hub