don't refresh game list if the browser tab/window isn't active, and refresh immediately when it becomes active if an update was missed

WebContent/js/cah.app.js

@@ -65,6 +65,17 @@ $(document).ready(function() {
   app_resize();
 });
 
+$(window).focus(function() {
+  cah.windowActive = true;
+  if (cah.missedGameListRefresh) {
+    cah.GameList.instance.update();
+  }
+});
+
+$(window).blur(function() {
+  cah.windowActive = false;
+});
+
 /**
  * Handle a key up event in the nick box. If the key was enter, try to register with the server.
  * 

WebContent/js/cah.gamelist.js

@@ -80,9 +80,12 @@ cah.GameList.prototype.hide = function() {
  * Query the server to update the game list.
  */
 cah.GameList.prototype.update = function() {
-  if ($(this.element_).is(":visible")) {
+  if ($(this.element_).is(":visible") && cah.windowActive) {
     // TODO display a loading indicator of some sort
     cah.Ajax.build(cah.$.AjaxOperation.GAME_LIST).run();
+    cah.missedGameListRefresh = false;
+  } else {
+    cah.missedGameListRefresh = true;
   }
 };
 

WebContent/js/cah.js

@@ -57,6 +57,21 @@ cah.ignoreList = {};
  */
 cah.hideConnectQuit = false;
 
+/**
+ * Whether the game's browser window has focus, so we don't update the game list when we're not
+ * active.
+ * 
+ * @type {Boolean}
+ */
+cah.windowActive = true;
+
+/**
+ * Whether we've missed a game list refresh due to not being the active window.
+ * 
+ * @type {Boolean}
+ */
+cah.missedGameListRefresh = false;
+
 /**
  * Binds a function to a "this object". Result is a new function that will do the right thing across
  * contexts.