Merge pull request #7698 from owncloud/backport_7631

only enable drag&drop upload if public upload is allowed

apps/files/js/file-upload.js

@@ -170,7 +170,7 @@ OC.Upload = {
 
 $(document).ready(function() {
 
-	if ( $('#file_upload_start').exists() ) {
+	if ( $('#file_upload_start').exists()&& $('#file_upload_start').is(':visible') ) {
 
 		var file_upload_param = {
 			dropZone: $('#content'), // restrict dropZone to content div