Add previews to OC.dialogs.filepicker(); Fix #4697

core/js/oc-dialogs.js

@@ -285,7 +285,11 @@ var OCdialogs = {
 					filename: entry.name,
 					date: OC.mtime2date(entry.mtime)
 				});
-				$li.find('img').attr('src', entry.mimetype_icon);
+				if (entry.mimetype === "httpd/unix-directory") {
+					$li.find('img').attr('src', OC.imagePath('core', 'filetypes/folder.png'));
+				} else {
+					$li.find('img').attr('src', OC.Router.generate('core_ajax_preview', {x:32, y:32, file:escapeHTML(dir+'/'+entry.name)}) );
+				}
 				self.$filelist.append($li);
 			});