diff --git a/src/plugins/designer/formwindoweditor.cpp b/src/plugins/designer/formwindoweditor.cpp
index e3d623c2660a5a69da0a197ef55069fc2299836f..8b82d2bab58099fd06e4e60394a87a69a65fc2a7 100644
--- a/src/plugins/designer/formwindoweditor.cpp
+++ b/src/plugins/designer/formwindoweditor.cpp
@@ -38,6 +38,8 @@
 #include <projectexplorer/projectnodes.h>
 #include <projectexplorer/nodesvisitor.h>
 
+#include <utils/qtcassert.h>
+
 #include <QtDesigner/QDesignerFormWindowInterface>
 #include <QtDesigner/QDesignerFormEditorInterface>
 #include <QtDesigner/QDesignerFormWindowManagerInterface>
@@ -359,7 +361,14 @@ QString FormWindowEditor::contextHelpId() const
 
 QString FormWindowEditor::contents() const
 {
-    if (m_host && m_host->formWindow())
-        return m_host->formWindow()->contents();
-    return QString::null;
+    if (!m_formWindow)
+        return QString::null;
+#if QT_VERSION > 0x040501
+    // Quiet save as of Qt 4.5.2
+    qdesigner_internal::FormWindowBase *fwb = qobject_cast<qdesigner_internal::FormWindowBase *>(m_formWindow);
+    QTC_ASSERT(fwb, return QString::null);
+    return fwb->fileContents();
+#else
+    return m_formWindow->contents();
+#endif
 }
diff --git a/src/plugins/designer/qt_private/formwindowbase_p.h b/src/plugins/designer/qt_private/formwindowbase_p.h
index 7c6d649e77f55e5b873955919d13c6639625cb16..b49fb88ea6969ae95358656da5f29709c34e43d7 100644
--- a/src/plugins/designer/qt_private/formwindowbase_p.h
+++ b/src/plugins/designer/qt_private/formwindowbase_p.h
@@ -78,6 +78,9 @@ public:
     QVariantMap formData();
     void setFormData(const QVariantMap &vm);
 
+    // Return contents without warnings. Should be 'contents(bool quiet)'
+    QString fileContents() const;
+
     // Return the widget containing the form. This is used to
     // apply embedded design settings to that are inherited (for example font).
     // These are meant to be applied to the form only and not to the other editors
diff --git a/src/plugins/designer/qt_private/qdesigner_formwindowmanager_p.h b/src/plugins/designer/qt_private/qdesigner_formwindowmanager_p.h
index 91f0c9c96d60592f0dee14c69e88a2d8f733172a..36aae1956c0732c3f02eb57b6f9c844560c809e8 100644
--- a/src/plugins/designer/qt_private/qdesigner_formwindowmanager_p.h
+++ b/src/plugins/designer/qt_private/qdesigner_formwindowmanager_p.h
@@ -74,6 +74,7 @@ Q_SIGNALS:
 
 public Q_SLOTS:
     virtual void closeAllPreviews() = 0;
+    void aboutPlugins();
 
 private:
     void *m_unused;
diff --git a/src/plugins/designer/syncqtheader.sh b/src/plugins/designer/syncqtheader.sh
index c184711451cf134e845fabd555f87fc50ce564a5..d9e98a85f9575d7544f4f84e216063360ed0a19e 100755
--- a/src/plugins/designer/syncqtheader.sh
+++ b/src/plugins/designer/syncqtheader.sh
@@ -55,8 +55,8 @@ syncHeader()
   TARGET=qt_private/$HDR
 
   # Exchange license header
-  head -n 32 formwindowfile.h > $TARGET || exit 1
-  tail -n +11 $QTHDR >> $TARGET || exit 1
+  head -n 28 formwindowfile.h > $TARGET || exit 1
+  tail -n +41 $QTHDR >> $TARGET || exit 1
 }
 
 for H in $REQUIRED_HEADERS