webui: enable state on all idnode based grids

src/webui/static/app/idnode.js

@@ -909,6 +909,8 @@ tvheadend.idnode_grid = function(panel, conf)
                       '->', '-', 'Per page', count ]
     });
     var grid   = new Ext.grid.EditorGridPanel({
+      stateful      : true,
+      stateId       : conf.url,
       stripeRows    : true,
       title         : conf.titleP,
       store         : store,

src/webui/static/app/tvheadend.js

@@ -5,6 +5,12 @@ tvheadend.conf_dvbin   = null;
 tvheadend.conf_tsdvr   = null;
 tvheadend.conf_csa     = null;
 
+/* State Provider */
+Ext.state.Manager.setProvider(new Ext.state.CookieProvider({
+  // 7 days from now
+  expires : new Date(new Date().getTime()+(1000*60*60*24*7)),
+}));
+
 /**
  * Displays a help popup window
  */