diff -Nru qt4-x11-4.7.2/debian/changelog qt4-x11-4.7.2/debian/changelog
--- qt4-x11-4.7.2/debian/changelog	2011-03-25 17:33:53.000000000 +0000
+++ qt4-x11-4.7.2/debian/changelog	2011-04-26 17:09:17.000000000 +0100
@@ -1,3 +1,10 @@
+qt4-x11 (4:4.7.2-0ubuntu6.1) natty-proposed; urgency=low
+
+  * Add kubuntu_92_qml_memory_leak.diff from Canonical Design team to
+    fix a memory leak in QML, LP: #723956
+
+ -- Jonathan Riddell <jriddell@ubuntu.com>  Tue, 26 Apr 2011 17:07:09 +0100
+
 qt4-x11 (4:4.7.2-0ubuntu6) natty; urgency=low
 
   * SECURITY UPDATE: Fake SSL certificates produced by Comodo, LP: #742377
diff -Nru qt4-x11-4.7.2/debian/patches/kubuntu_92_qml_memory_leak.diff qt4-x11-4.7.2/debian/patches/kubuntu_92_qml_memory_leak.diff
--- qt4-x11-4.7.2/debian/patches/kubuntu_92_qml_memory_leak.diff	1970-01-01 01:00:00.000000000 +0100
+++ qt4-x11-4.7.2/debian/patches/kubuntu_92_qml_memory_leak.diff	2011-04-26 17:06:24.000000000 +0100
@@ -0,0 +1,49 @@
+From adb6a8043cac315730c231da5e70cb80570a9b7b Mon Sep 17 00:00:00 2001
+From: Florian Boucault <florian.boucault@canonical.com>
+Date: Tue, 26 Apr 2011 17:50:54 +0200
+Subject: [PATCH] Immediatly delete obj in release() rather than using deleteLater()
+
+Fixes a memory leak in unity-2d-places, see:
+https://bugs.launchpad.net/unity-2d/+bug/723956
+
+Test-case to reproduce:
+---
+import Qt 4.7
+
+Item {
+    Repeater {
+        id: repeater
+        delegate: Item{
+                  }
+    }
+    focus: true
+    Keys.onPressed: {
+        if (event.key == Qt.Key_Return) {
+            var i
+            for (i=0; i<300; i++) {
+                repeater.model = 100
+                repeater.model = 0
+            }
+        }
+    }
+}
+---
+---
+ .../graphicsitems/qdeclarativevisualitemmodel.cpp  |    2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/src/declarative/graphicsitems/qdeclarativevisualitemmodel.cpp b/src/declarative/graphicsitems/qdeclarativevisualitemmodel.cpp
+index 065a388..a7884c0 100644
+--- a/src/declarative/graphicsitems/qdeclarativevisualitemmodel.cpp
++++ b/src/declarative/graphicsitems/qdeclarativevisualitemmodel.cpp
+@@ -994,7 +994,7 @@ QDeclarativeVisualDataModel::ReleaseFlags QDeclarativeVisualDataModel::release(Q
+                 item->scene()->removeItem(item);
+         }
+         stat |= Destroyed;
+-        obj->deleteLater();
++        delete obj;
+     } else if (!inPackage) {
+         stat |= Referenced;
+     }
+-- 
+1.7.4.1
diff -Nru qt4-x11-4.7.2/debian/patches/series qt4-x11-4.7.2/debian/patches/series
--- qt4-x11-4.7.2/debian/patches/series	2011-03-25 10:34:39.000000000 +0000
+++ qt4-x11-4.7.2/debian/patches/series	2011-04-26 17:06:32.000000000 +0100
@@ -48,3 +48,4 @@
 kubuntu_23_arm_memory_barriers.patch
 kubuntu_02_neon_flags.patch
 kubuntu_30_blacklist_ssl_certificates.diff
+kubuntu_92_qml_memory_leak.diff