Prepare for deprecating the QDesktopWidget

QDesktopWidget is marked as obsolete in docs, but it is not yet
completely deprecated, some of its methods are still in use.

Replace uses of the following methods marked as obsolete:
- QDesktopWidget::screenNumber(QWidget*) -> QWidget::screen()
- QDesktopWidget::screenGeometry(QWidget*) -> QWidget::screen()->geometry()
- QDesktopWidget::availableGeometry(QWidget*) -> QWidget::screen()->availableGeometry()

Task-number: QTBUG-76491
Change-Id: I2cca30f2b4caa6e6848e8190e09f959d2c272f33
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp b/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp
index 5a51f15008..27ae41fc4f 100644
--- a/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp
+++ b/tests/auto/widgets/util/qcompleter/tst_qcompleter.cpp
@@ -1765,7 +1765,7 @@ void tst_QCompleter::QTBUG_52028_tabAutoCompletes()
     auto le = new QLineEdit;
     w.layout()->addWidget(le);
 
-    const auto pos = QApplication::desktop()->availableGeometry(&w).topLeft() + QPoint(200,200);
+    const auto pos = w.screen()->availableGeometry().topLeft() + QPoint(200,200);
     w.move(pos);
     w.show();
     QApplication::setActiveWindow(&w);
@@ -1806,7 +1806,7 @@ void tst_QCompleter::QTBUG_51889_activatedSentTwice()
 
     w.layout()->addWidget(new QLineEdit);
 
-    const auto pos = QApplication::desktop()->availableGeometry(&w).topLeft() + QPoint(200,200);
+    const auto pos = w.screen()->availableGeometry().topLeft() + QPoint(200,200);
     w.move(pos);
     w.show();
     QApplication::setActiveWindow(&w);