add back client side watcher handling for rename

plugins/c9.ide.watcher/watcher.js

@@ -46,10 +46,29 @@ define(function(require, exports, module) {
                 }
             }
             
+            function unwatchChildren(e) {
+                e.watchers = [];
+                Object.keys(handlers).forEach(function(path) {
+                    if (path == e.path || path.startsWith(e.path + "/")) {
+                        if (unwatch(path))
+                            e.watchers.push(path.slice(e.path.length));
+                    }
+                });
+                ignoreHandler(e);
+            }
+            
+            function rewatchChildren(e) {
+                doneHandler(e);
+                var toPath = e.result[0] ? e.path : e.args[1];
+                e.watchers.forEach(function(path) {
+                    watch(toPath + path);
+                });
+            }
+            
             fs.on("beforeWriteFile", ignoreHandler, plugin);
             fs.on("afterWriteFile", doneHandler, plugin);
-            fs.on("beforeRename", ignoreHandler, plugin);
-            fs.on("afterRename", doneHandler, plugin);
+            fs.on("beforeRename", unwatchChildren, plugin);
+            fs.on("afterRename", rewatchChildren, plugin);
             fs.on("beforeMkdir", ignoreHandler, plugin);
             fs.on("afterMkdir", doneHandler, plugin);
             fs.on("beforeMkdirP", ignoreHandler, plugin);