diff -r 5456b4e8b3a8 -r 3321d3e205b6 taskswitcher/taskswitcherui/taskswitcherapp/src/tsappui.cpp
--- a/taskswitcher/taskswitcherui/taskswitcherapp/src/tsappui.cpp	Wed Sep 01 12:32:46 2010 +0100
+++ b/taskswitcher/taskswitcherui/taskswitcherapp/src/tsappui.cpp	Tue Sep 14 20:58:58 2010 +0300
@@ -155,6 +155,7 @@
     iApplicationTask.SetWgId( iWg.Identifier() );
 
     // And finally, go to background.
+    iForeground = ETrue;
     MoveAppToBackground( ENoneTransition );
     
     iEikonEnv->RootWin().SetOrdinalPosition(-1, ECoeWinPriorityNeverAtFront);
@@ -167,11 +168,6 @@
     iUiStarted = EFalse;
     iDisableAppKeyHandling = EFalse;
     
-    // Set process priority to high to avoid being
-    // locked by heavy ui apps processing
-    iEikonEnv->WsSession().ComputeMode(RWsSession::EPriorityControlDisabled);
-    RProcess().SetPriority(EPriorityHigh);
-    
     iForegroundDelayed = EFalse;
     iDelayedForegroundInProgress = EFalse;
     
@@ -183,7 +179,7 @@
 // Perform the first phase of two phase construction
 // -----------------------------------------------------------------------------
 //
-CTsAppUi::CTsAppUi(): iForeground( ETrue ),
+CTsAppUi::CTsAppUi(): iForeground( EFalse ),
                                       iApplicationTask( iCoeEnv->WsSession() )
     {
     // no implementation required
@@ -196,7 +192,7 @@
 //
 CTsAppUi::~CTsAppUi()
     {
-    if( GfxTransEffect::IsRegistered( iAppView ) )
+    if( iAppView && GfxTransEffect::IsRegistered( iAppView ) )
         {
         GfxTransEffect::Deregister(iAppView);
         
@@ -270,6 +266,7 @@
                                 TUint aSubCom )
     {
     const TDesC8* ptr = reinterpret_cast<const TDesC8*>(iAppView);
+    GfxTransEffect::AbortFullScreen();
     GfxTransEffect::Abort(iAppView);
     GfxTransEffect::Begin( iAppView, aTranstionId );
     GfxTransEffect::SetDemarcation( iAppView, iAppView->Rect() );
@@ -301,6 +298,7 @@
         {
         // App start animation
         const TDesC8* ptr = reinterpret_cast<const TDesC8*>(iAppView);
+        GfxTransEffect::AbortFullScreen();
         GfxTransEffect::Abort(iAppView);
         TInt groupId = GfxTransEffect::BeginGroup();
         GfxTransEffect::BeginFullScreen(
@@ -538,6 +536,8 @@
 //
 TInt CTsAppUi::GoToBackgroundTimerCallback( TAny* aParam )
     {
+    TSLOG_STATIC_CONTEXT( GoToBackgroundTimerCallback, TSLOG_LOCAL, RThread().Id() );
+    TSLOG_IN();
     CTsAppUi* self = static_cast<CTsAppUi*>( aParam );
     if ( self->iGoToBackgroundTimer )
         {
@@ -550,7 +550,7 @@
 
     // Notify
     self->HandleSwitchToBackgroundEvent();
-
+    TSLOG_OUT();
     return 0;
     }
 
@@ -584,6 +584,10 @@
     TSLOG_CONTEXT( MoveAppToForeground, TSLOG_LOCAL );
     TSLOG_IN();
 
+    if ( !iUiStarted )
+        {
+        TRAP_IGNORE( iUnderAppWgId = WgIdOfUnderlyingAppL(EFalse) );
+        }
     iUiStarted = ETrue;
     
     // Request window server to bring our application
@@ -626,7 +630,8 @@
         {
         iForeground = EFalse;
         SetTaskswitcherStateProperty( KTaskswitcherBackgroundValue );
-
+        
+        iAppView->MakeVisible( EFalse );
         // notify view
         iAppView->HandleSwitchToBackgroundEvent();
         
@@ -743,7 +748,6 @@
             {
             SetOrientationL(EAppUiOrientationPortrait);
             }
-        RProcess().SetPriority(EPriorityForeground);
         SetFullScreenApp(EFalse);
         iEikonEnv->RootWin().SetOrdinalPosition(0, ECoeWinPriorityAlwaysAtFront);
         }
@@ -765,7 +769,6 @@
         iEikonEnv->RootWin().SetOrdinalPosition(-1, ECoeWinPriorityNeverAtFront);
         SetOrientationL(EAppUiOrientationAutomatic);
         SetFullScreenApp(EFalse);
-        RProcess().SetPriority(EPriorityHigh);
         }
     TSLOG_OUT();
     }
@@ -802,12 +805,16 @@
 void CTsAppUi::HandleWsEventL(const TWsEvent& aEvent,
         CCoeControl* aDestination)
     {
+    TSLOG_CONTEXT( CTsAppUi::HandleWsEventL, TSLOG_LOCAL );
     CAknAppUi::HandleWsEventL(aEvent, aDestination);
     TInt eventType = aEvent.Type();
     if ( eventType == EEventWindowGroupListChanged )
         {
         TInt wgId = WgIdOfUnderlyingAppL(EFalse); 
+        TSLOG2( TSLOG_INFO, "WgIdOfUnderlyingAppL: %d appId: %d",
+                wgId, GetAppIdL( wgId ).iUid );
         if ( iForeground &&
+             wgId &&
              wgId != iUnderAppWgId &&
              !iAppView->AppCloseInProgress(iUnderAppWgId) &&
              !iAppView->WgOnTaskList(wgId) )
@@ -820,6 +827,7 @@
             }
         iUnderAppWgId = wgId;
         }
+    TSLOG_OUT();
     }
 
 
@@ -829,12 +837,19 @@
 //
 TInt CTsAppUi::WgIdOfUnderlyingAppL( TBool aIgnoreParentChild )
     {
+    TSLOG_CONTEXT( CTsAppUi::WgIdOfUnderlyingAppL, TSLOG_LOCAL );
     TInt retVal(0);
     TInt underlyingWg = CheckForUnderlyingHiddenAppsL();
     if ( !underlyingWg )
         {
-        TApaTaskList taskList( iEikonEnv->WsSession() );
+        TApaTaskList taskList(iEikonEnv->WsSession());
         underlyingWg = taskList.FindByPos(0).WgId();
+        if ( !(GetAppIdL(underlyingWg).iUid) )
+            {
+            TSLOG1 (TSLOG_INFO, "Incorrect  underlying window group: %d.", underlyingWg );
+            TSLOG0 (TSLOG_INFO, "No association to appId, nor special handling for underlying hidden apps.Change return value into 0.");
+            underlyingWg = 0;
+            }
         }
     
     if ( aIgnoreParentChild )
@@ -846,6 +861,7 @@
         TInt parentWg = GetTopParentWg( underlyingWg );
         retVal = parentWg ? parentWg : underlyingWg;
         }
+    TSLOG_OUT();
     return retVal;
     }
 
@@ -916,10 +932,7 @@
     TInt underlyingWg(allWgIds[0].iId);
     CleanupStack::PopAndDestroy(&allWgIds);
     
-    CApaWindowGroupName* windowName =
-        CApaWindowGroupName::NewLC( iEikonEnv->WsSession(), underlyingWg );
-    TUid appUid = windowName->AppUid();
-    CleanupStack::PopAndDestroy( windowName );
+    TUid appUid = GetAppIdL( underlyingWg );
     if( appUid == KTsCameraUid ||
         appUid == KTsTelephoneUid )
         {
@@ -939,10 +952,7 @@
     TApaTaskList taskList( iEikonEnv->WsSession() );
     TInt underlyingWg = taskList.FindByPos(0).WgId();
     
-    CApaWindowGroupName* windowName =
-        CApaWindowGroupName::NewLC( iEikonEnv->WsSession(), underlyingWg );
-    TUid appUid = windowName->AppUid();
-    CleanupStack::PopAndDestroy( windowName );
+    TUid appUid = GetAppIdL( underlyingWg );
     if ( appUid == KTsCameraUid )
         {
         retVal = ETrue;
@@ -961,4 +971,18 @@
     return iDelayedForegroundInProgress;
     }
 
+// -----------------------------------------------------------------------------
+// CTsAppUi::GetAppIdL
+// -----------------------------------------------------------------------------
+//
+TUid CTsAppUi::GetAppIdL( TInt aWgId )
+    {
+    TUid retVal;
+    CApaWindowGroupName* windowName =
+        CApaWindowGroupName::NewLC( iEikonEnv->WsSession(), aWgId );
+    retVal = windowName->AppUid();
+    CleanupStack::PopAndDestroy( windowName );
+    return retVal;
+    }
+
 // End of file