Reduce usage of QDesktopWidget to resolve screen properties in QtWidgets

Removes the need to initialize QDesktopWidget, just to look up which
screen a widget would map to, the geometry of a screen, number of
screens, etc.

Change-Id: Ieb153b9ff6d3fba645fc528d6e430e8392f990bf
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/widgets/graphicsview/qgraphicsview.cpp b/src/widgets/graphicsview/qgraphicsview.cpp
index 4b7890e9ff..1cc8543fdd 100644
--- a/src/widgets/graphicsview/qgraphicsview.cpp
+++ b/src/widgets/graphicsview/qgraphicsview.cpp
@@ -284,6 +284,7 @@ static const int QGRAPHICSVIEW_PREALLOC_STYLE_OPTIONS = 503; // largest prime <
 #include <QtCore/qscopedvaluerollback.h>
 #include <QtWidgets/qapplication.h>
 #include <QtWidgets/qdesktopwidget.h>
+#include <private/qdesktopwidget_p.h>
 #include <QtGui/qevent.h>
 #include <QtWidgets/qlayout.h>
 #include <QtGui/qtransform.h>
@@ -1248,7 +1249,7 @@ QSize QGraphicsView::sizeHint() const
     if (d->scene) {
         QSizeF baseSize = d->matrix.mapRect(sceneRect()).size();
         baseSize += QSizeF(d->frameWidth * 2, d->frameWidth * 2);
-        return baseSize.boundedTo((3 * QApplication::desktop()->size()) / 4).toSize();
+        return baseSize.boundedTo((3 * QDesktopWidgetPrivate::size()) / 4).toSize();
     }
     return QAbstractScrollArea::sizeHint();
 }