Revert "Fixes a memory leak on IE8 in LayoutManagerIE8 (#12688)"

This reverts commit 024692835d1e2af1a4053821959f03f8d5eb4fcb.

Change-Id: I19cf6ee66a21f7eb07d0f1fd8b9698ae88454700

2 files changed, 3 insertions, 24 deletions

diff --git a/client/src/com/vaadin/client/LayoutManager.java b/client/src/com/vaadin/client/LayoutManager.java
index 5b27031a29..1ced003146 100644
--- a/client/src/com/vaadin/client/LayoutManager.java
+++ b/client/src/com/vaadin/client/LayoutManager.java
@@ -75,15 +75,6 @@ public class LayoutManager {
     }
 
     /**
-     * Returns the application connection for this layout manager.
-     * 
-     * @return connection
-     */
-    protected ApplicationConnection getConnection() {
-        return connection;
-    }
-
-    /**
      * Gets the layout manager associated with the given
      * {@link ApplicationConnection}.
      * 
diff --git a/client/src/com/vaadin/client/LayoutManagerIE8.java b/client/src/com/vaadin/client/LayoutManagerIE8.java
index b7973310db..a692f126a2 100644
--- a/client/src/com/vaadin/client/LayoutManagerIE8.java
+++ b/client/src/com/vaadin/client/LayoutManagerIE8.java
@@ -19,8 +19,8 @@ import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
 
+import com.google.gwt.dom.client.Document;
 import com.google.gwt.dom.client.Element;
-import com.google.gwt.dom.client.Node;
 import com.google.gwt.user.client.ui.RootPanel;
 
 /**
@@ -39,12 +39,6 @@ public class LayoutManagerIE8 extends LayoutManager {
 
     private Map<Element, MeasuredSize> measuredSizes = new HashMap<Element, MeasuredSize>();
 
-    // this method is needed to test for memory leaks (see
-    // LayoutMemoryUsageIE8ExtensionConnector) but can be private
-    private int getMeasuredSizesMapSize() {
-        return measuredSizes.size();
-    }
-
     @Override
     protected void setMeasuredSize(Element element, MeasuredSize measuredSize) {
         if (measuredSize != null) {
@@ -68,18 +62,12 @@ public class LayoutManagerIE8 extends LayoutManager {
     @Override
     protected void cleanMeasuredSizes() {
         Profiler.enter("LayoutManager.cleanMeasuredSizes");
-
-        // #12688: IE8 was leaking memory when adding&removing components.
-        // Uses IE specific logic to figure if an element has been removed from
-        // DOM or not. For this the parent element of the current UI is needed.
-        // For removed elements the measured size is discarded.
-        Node rootNode = getConnection().getUIConnector().getWidget()
-                .getElement().getParentNode();
+        Document document = RootPanel.get().getElement().getOwnerDocument();
 
         Iterator<Element> i = measuredSizes.keySet().iterator();
         while (i.hasNext()) {
             Element e = i.next();
-            if (!rootNode.isOrHasChild(e)) {
+            if (e.getOwnerDocument() != document) {
                 i.remove();
             }
         }