From 8b7dea70d5b9821baac636e337b4781d03c0cff6 Mon Sep 17 00:00:00 2001
From: Jan Schneider <jan@horde.org>
Date: Wed, 16 Jun 2010 18:18:01 +0200
Subject: [PATCH] Port purge() from 1.7.

---
 horde/js/prototype.js | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/horde/js/prototype.js b/horde/js/prototype.js
index 90a583f4c..5b539235c 100644
--- a/horde/js/prototype.js
+++ b/horde/js/prototype.js
@@ -1787,6 +1787,15 @@ if (!Node.ELEMENT_NODE) {
 Element.cache = { };
 Element.idCounter = 1;
 
+function purgeElement(element) {
+  var uid = element._prototypeUID;
+  if (uid) {
+    Element.stopObserving(element);
+    element._prototypeUID = void 0;
+    delete Element.Storage[uid];
+  }
+}
+
 Element.Methods = {
   visible: function(element) {
     return $(element).style.display != 'none';
@@ -1861,6 +1870,10 @@ Element.Methods = {
     function update(element, content) {
       element = $(element);
 
+      var descendants = element.getElementsByTagName('*'),
+       i = descendants.length;
+      while (i--) purgeElement(descendants[i]);
+
       if (content && content.toElement)
         content = content.toElement();
 
@@ -3150,6 +3163,18 @@ Element.addMethods({
       }
     }
     return Element.extend(clone);
+  },
+  
+  purge: function(element) {
+    if (!(element = $(element))) return;
+    purgeElement(element);
+
+    var descendants = element.getElementsByTagName('*'),
+     i = descendants.length;
+
+    while (i--) purgeElement(descendants[i]);
+
+    return null;
   }
 });
 /* Portions of the Selector class are derived from Jack Slocum's DomQuery,
-- 
2.11.0