Move notification of layout change up from QApplication to QGuiApplication.

QGuiApplication-using things (like QtQuick) need to know about this, too -- this
makes QGuiApplication::setLayoutDirection actually work.

Task-number: QTBUG-21573
Change-Id: I2d2ac7dc07f11be5c7e501a3575b1d0978d8ac31
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jan Arve Sæther <jan-arve.saether@digia.com>

src/gui/kernel/qguiapplication.cpp

@@ -2548,6 +2548,11 @@ void QGuiApplication::setFont(const QFont &font)
 
 void QGuiApplicationPrivate::notifyLayoutDirectionChange()
 {
+    const QWindowList list = QGuiApplication::topLevelWindows();
+    for (int i = 0; i < list.size(); ++i) {
+        QEvent ev(QEvent::ApplicationLayoutDirectionChange);
+        QCoreApplication::sendEvent(list.at(i), &ev);
+    }
 }
 
 void QGuiApplicationPrivate::notifyActiveWindowChange(QWindow *)

src/widgets/kernel/qapplication.cpp

@@ -1888,16 +1888,6 @@ bool QApplication::event(QEvent *e)
     \obsolete
 */
 
-void QApplicationPrivate::notifyLayoutDirectionChange()
-{
-    QWidgetList list = QApplication::topLevelWidgets();
-    for (int i = 0; i < list.size(); ++i) {
-        QWidget *w = list.at(i);
-        QEvent ev(QEvent::ApplicationLayoutDirectionChange);
-        QCoreApplication::sendEvent(w, &ev);
-    }
-}
-
 /*!
     \fn void QApplication::setActiveWindow(QWidget* active)
 

src/widgets/kernel/qapplication_p.h

@@ -116,7 +116,6 @@ public:
     QApplicationPrivate(int &argc, char **argv, int flags);
     ~QApplicationPrivate();
 
-    virtual void notifyLayoutDirectionChange();
     virtual void notifyActiveWindowChange(QWindow *);
 
     virtual bool shouldQuit();