Do not use QExposedEvent::region() in internal code

Task-number: QTBUG-104857
Change-Id: I5ee41802ecc4d6291aaaa1f0efddd20027c1c1e4
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 12262adebad5e4af2cf2c9a6dd41a941c78f1988)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/gui/kernel/qevent.cpp

@@ -3989,10 +3989,7 @@ QDebug operator<<(QDebug dbg, const QEvent *e)
     bool isMouse = false;
     switch (type) {
     case QEvent::Expose:
-QT_WARNING_PUSH
+        dbg << "QExposeEvent()";
-QT_WARNING_DISABLE_DEPRECATED
-        dbg << "QExposeEvent(" << static_cast<const QExposeEvent *>(e)->region() << ')';
-QT_WARNING_POP
         break;
     case QEvent::Paint:
         dbg << "QPaintEvent(" << static_cast<const QPaintEvent *>(e)->region() << ')';

src/gui/kernel/qevent.h

@@ -516,6 +516,7 @@ public:
 
 protected:
     QRegion m_region;
+    friend class QWidgetWindow;
 };
 
 class Q_GUI_EXPORT QPlatformSurfaceEvent : public QEvent

src/widgets/kernel/qwidgetwindow.cpp

@@ -1002,11 +1002,8 @@ void QWidgetWindow::handleExposeEvent(QExposeEvent *event)
         m_widget->setAttribute(Qt::WA_Mapped);
         for (QWidget *p = m_widget->parentWidget(); p && !p->testAttribute(Qt::WA_Mapped); p = p->parentWidget())
             p->setAttribute(Qt::WA_Mapped);
-QT_WARNING_PUSH
+        if (!event->m_region.isNull())
-QT_WARNING_DISABLE_DEPRECATED
+            wPriv->syncBackingStore(event->m_region);
-        if (!event->region().isNull())
-            wPriv->syncBackingStore(event->region());
-QT_WARNING_POP
     } else {
         m_widget->setAttribute(Qt::WA_Mapped, false);
     }

tests/auto/gui/kernel/qbackingstore/tst_qbackingstore.cpp

@@ -239,7 +239,7 @@ public:
         backingStore.resize(size());
     }
 
-    void exposeEvent(QExposeEvent *event) override
+    void paintEvent(QPaintEvent *event) override
     {
         QRect rect(QPoint(), size());
 
@@ -251,10 +251,7 @@ public:
 
         backingStore.endPaint();
 
-QT_WARNING_PUSH
-QT_WARNING_DISABLE_DEPRECATED
         backingStore.flush(event->region().boundingRect());
-QT_WARNING_POP
     }
 
 private:

tests/auto/gui/kernel/qwindow/tst_qwindow.cpp

@@ -287,13 +287,6 @@ public:
         m_received[event->type()]++;
         m_order << event->type();
         switch (event->type()) {
-        case QEvent::Expose:
-QT_WARNING_PUSH
-QT_WARNING_DISABLE_DEPRECATED
-            m_exposeRegion = static_cast<QExposeEvent *>(event)->region();
-QT_WARNING_POP
-            break;
-
         case QEvent::PlatformSurface:
             m_surfaceventType = static_cast<QPlatformSurfaceEvent *>(event)->surfaceEventType();
             break;
@@ -323,11 +316,6 @@ QT_WARNING_POP
         return m_order.indexOf(type);
     }
 
-    QRegion exposeRegion() const
-    {
-        return m_exposeRegion;
-    }
-
     QPlatformSurfaceEvent::SurfaceEventType surfaceEventType() const
     {
         return m_surfaceventType;
@@ -339,7 +327,6 @@ QT_WARNING_POP
 private:
     QHash<QEvent::Type, int> m_received;
     QList<QEvent::Type> m_order;
-    QRegion m_exposeRegion;
     QPlatformSurfaceEvent::SurfaceEventType m_surfaceventType;
 };
 
@@ -797,16 +784,6 @@ void tst_QWindow::isExposed()
     QTRY_VERIFY(window.received(QEvent::Expose) > 0);
     QTRY_VERIFY(window.isExposed());
 
-#ifndef Q_OS_WIN
-    // This is a top-level window so assuming it is completely exposed, the
-    // expose region must be (0, 0), (width, height). If this is not the case,
-    // the platform plugin is sending expose events with a region in an
-    // incorrect coordinate system.
-    QRect r = window.exposeRegion().boundingRect();
-    r = QRect(window.mapToGlobal(r.topLeft()), r.size());
-    QCOMPARE(r, window.geometry());
-#endif
-
     window.hide();
 
     QCoreApplication::processEvents();