Remove deleted pads from the drive

www/common/userObject.js

@@ -380,6 +380,18 @@ define([
             var trashpaths = _findFileInTrash([TRASH], file);
             return rootpaths.concat(templatepaths, trashpaths);
         };
+
+        // Get drive ids of files from their channel ids
+        exp.findChannels = function (channels) {
+            var allFilesList = files[FILES_DATA];
+            var channels64 = channels.slice().map(Util.hexToBase64);
+            return getFiles([FILES_DATA]).filter(function (k) {
+                var data = allFilesList[k];
+                var parsed = Hash.parsePadUrl(data.href);
+                return parsed.hashData && channels64.indexOf(parsed.hashData.channel) !== -1;
+            });
+        };
+
         exp.search = function (value) {
             if (typeof(value) !== "string") { return []; }
             value = value.trim();