diff -r 923ff622b8b9 -r 4633027730f5 src/hbcore/gui/hbmainwindow.cpp
--- a/src/hbcore/gui/hbmainwindow.cpp	Tue Jul 06 14:36:53 2010 +0300
+++ b/src/hbcore/gui/hbmainwindow.cpp	Wed Aug 18 10:05:37 2010 +0300
@@ -30,9 +30,10 @@
 #include <QGraphicsWidget>
 #include <QGraphicsItem>
 #include <QGraphicsScene>
-
+#include <QApplication>
 #include "hbaction.h"
 #include "hbbackgrounditem_p.h"
+#include "hbscreenshotitem_p.h"
 #include "hbdeviceprofile_p.h"
 #include "hbindicatorgroup_p.h"
 #include "hbinstance.h"
@@ -63,6 +64,7 @@
 #include "hboogmwatcher_p.h"
 #include "hbwindowobscured_p.h"
 #include "hbsleepmodelistener_p.h"
+#include "hbforegroundwatcher_p.h"
 
 #ifdef Q_OS_SYMBIAN
 #include <coecntrl.h>
@@ -287,6 +289,7 @@
 
     // No need for any default (e.g. blank white) background for this window.
     setAttribute(Qt::WA_NoSystemBackground);
+    viewport()->setAttribute(Qt::WA_NoSystemBackground);
     setOptimizationFlag(QGraphicsView::DontSavePainterState);
 
     // Continue with basic initialization. Note: Prefer doing everything that is
@@ -326,9 +329,9 @@
         d->mAutomaticOrientationSwitch = false;
     }
 
-#if defined(Q_WS_S60) || defined(HB_Q_WS_MAEMO)
+#if defined(Q_OS_SYMBIAN) || defined(HB_Q_WS_MAEMO)
     setWindowState(Qt::WindowFullScreen);
-#endif//Q_WS_S60
+#endif
 
     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
@@ -355,6 +358,8 @@
 
     // add clipping item
     d->mClippingItem = new HbScreen;
+    //makes sure clipiingItem layout is activated before any of its childitems.
+    QApplication::postEvent(d->mClippingItem, new QEvent(QEvent::LayoutRequest));
     d->mClippingItem->setParentItem(d->mRootItem);
     d->mClippingItem->setZValue(HbPrivate::ContentZValue);
 
@@ -398,6 +403,9 @@
     // Make sure the sleep mode listener instance is created.
     HbSleepModeListener::instance();
 
+    // Have also the foregroundwatcher up and running.
+    HbForegroundWatcher::instance();
+
     HbWindowObscured::installWindowEventFilter();
 
 #ifdef HB_GESTURE_FW
@@ -631,6 +639,9 @@
     // Switching to null view or to the one that is current will do nothing.
     if (view && oldView != view) {
         emit aboutToChangeView(oldView, view);
+        if (isObscured()) {
+            animate = false;
+        }
         if (oldView && animate) {
             if (flags & Hb::ViewSwitchFullScreen) {
                 flags |= Hb::ViewSwitchSequential;
@@ -939,6 +950,21 @@
         event->accept();
         break;
 
+#ifdef __WINSCW__
+    // Support for testing orientation change on the winscw emulator: When enabled,
+    // pressing '9' will toggle (and force) the orientation.
+    case Qt::Key_9:
+        if (QFile::exists("c:/resource/hb_ori_simu")) {
+            if (orientation() == Qt::Horizontal) {
+                setOrientation(Qt::Vertical);
+            } else {
+                setOrientation(Qt::Horizontal);
+            }
+        }
+        QGraphicsView::keyPressEvent(event);
+        break;
+#endif
+
     default:
         QGraphicsView::keyPressEvent(event);
         break;
@@ -982,6 +1008,9 @@
         if (d->mBgItem) {
             d->mBgItem->resize(newSize);
         }
+        if (d->mScreenshotItem) {
+            d->mScreenshotItem->resize(newSize);
+        }
     }
 }
 
@@ -1080,8 +1109,13 @@
     // Enable surface transparency if QWidget did not do it already. This is a
     // workaround for having non-transparent surfaces filled automatically with
     // black color. The showEvent is a suitable place because the native control
-    // is already created at this point, but it is not too late either.
+    // is already created at this point, but it is not too late either. Note
+    // that while this is meant to be a workaround, the system transition
+    // effects may actually rely on (and require) this behavior.
     if (!testAttribute(Qt::WA_TranslucentBackground)) {
+        // The Qt::WA_TranslucentBackground attribute cannot be used here
+        // because that can only be enabled, disabling does not seem to be
+        // supported.
         RWindow *const window = static_cast<RWindow *>(effectiveWinId()->DrawableWindow());
         window->SetSurfaceTransparency(true);
     }
@@ -1096,7 +1130,7 @@
 }
 
 /*!
-    Reimplemented from QAbstractScrollArea::scrollContentsBy().
+    \reimp
 */
 void HbMainWindow::scrollContentsBy(int dx, int dy)
 {
@@ -1131,7 +1165,7 @@
 }
 
 /*
-    // reimplemented from QWidget
+    \reimp
 */
 bool HbMainWindow::event(QEvent *event)
 {
@@ -1143,6 +1177,26 @@
     return QGraphicsView::event(event);
 }
 
+/*
+    \reimp
+*/
+void HbMainWindow::drawBackground(QPainter *painter, const QRectF &rect)
+{
+    QGraphicsView::drawBackground(painter, rect);
+    // The background item's paint() does not get called automatically so call
+    // it directly and optimize it by setting a proper clipping rectangle.
+    Q_D(HbMainWindow);
+    if (d->mBgItem) {
+        // No need to save/restore the painter state here.
+        if (d->mBgItem->imageMode() != Hb::DoNotDrawBackground &&
+            (!qFuzzyCompare(rect.height(), d->mBgItem->boundingRect().height()) ||
+             !qFuzzyCompare(rect.width(), d->mBgItem->boundingRect().width()))) {
+            painter->setClipRect(rect, Qt::ReplaceClip);
+        }
+        d->mBgItem->paint(painter, 0, 0);
+    }
+}
+
 HbRootItem::HbRootItem(QGraphicsItem *parent)
     : HbWidget(parent)
 {