winrt: Handle WaitForWindowExposed

As winrt does not have native windows, exposure check was just done by
checking, whether the window is the active window. If a window is shown
fullscreen though, winrtscreen will be resized. This resize triggers a
resize of every maximized or fullscreen window that is shown.
If we enter or leave full screen mode, we have to wait until the screen
resize and the subsequent window resizes are done and only then we can
consider the windows properly exposed.

This patch reverts 54bcb9d42f  and thus
unblacklists tst_QGraphicsItem::cursor on WinRT.

Fixes: QTBUG-73545
Change-Id: If469fce319ed6b3a5d56b7bf3cbc11929b72bb11
Reviewed-by: Andre de la Rocha <andre.rocha@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>

src/plugins/platforms/winrt/qwinrtscreen.cpp

@@ -511,6 +511,7 @@ public:
     QWindow *currentPressWindow = nullptr;
     QWindow *currentTargetWindow = nullptr;
     bool firstMouseMove = true;
+    bool resizePending = false;
 };
 
 // To be called from the XAML thread
@@ -1402,6 +1403,18 @@ void QWinRTScreen::emulateMouseMove(const QPointF &point, MousePositionTransitio
                                              Qt::NoModifier);
 }
 
+void QWinRTScreen::setResizePending()
+{
+    Q_D(QWinRTScreen);
+    d->resizePending = true;
+}
+
+bool QWinRTScreen::resizePending() const
+{
+    Q_D(const QWinRTScreen);
+    return d->resizePending;
+}
+
 HRESULT QWinRTScreen::onActivated(ICoreWindow *, IWindowActivatedEventArgs *args)
 {
     Q_D(QWinRTScreen);
@@ -1507,7 +1520,7 @@ HRESULT QWinRTScreen::onRedirectReleased(ICorePointerRedirector *, IPointerEvent
     return onPointerUpdated(nullptr, args);
 }
 
-HRESULT QWinRTScreen::onWindowSizeChanged(IApplicationView *, IInspectable *)
+HRESULT QWinRTScreen::onWindowSizeChanged(IApplicationView *w, IInspectable *)
 {
     Q_D(QWinRTScreen);
 
@@ -1527,6 +1540,9 @@ HRESULT QWinRTScreen::onWindowSizeChanged(IApplicationView *, IInspectable *)
     QWindowSystemInterface::handleScreenGeometryChange(screen(), geometry(), availableGeometry());
     QPlatformScreen::resizeMaximizedWindows();
     handleExpose();
+    // If we "emulate" a resize, w will be nullptr.Checking w shows whether it's a real resize
+    if (w)
+        d->resizePending = false;
     return S_OK;
 }
 

src/plugins/platforms/winrt/qwinrtscreen.h

@@ -136,6 +136,9 @@ public:
 
     void emulateMouseMove(const QPointF &point, MousePositionTransition transition);
 
+    void setResizePending();
+    bool resizePending() const;
+
 private:
     void handleExpose();
 

src/plugins/platforms/winrt/qwinrtwindow.cpp

@@ -225,7 +225,8 @@ bool QWinRTWindow::isActive() const
 
 bool QWinRTWindow::isExposed() const
 {
-    const bool exposed = isActive();
+    Q_D(const QWinRTWindow);
+    const bool exposed = isActive() && !d->screen->resizePending();
     return exposed;
 }
 
@@ -360,6 +361,7 @@ void QWinRTWindow::setWindowState(Qt::WindowStates state)
             qCDebug(lcQpaWindows) << "Failed to enter full screen mode.";
             return;
         }
+        d->screen->setResizePending();
         d->state = state;
         return;
     }
@@ -384,6 +386,7 @@ void QWinRTWindow::setWindowState(Qt::WindowStates state)
             qCDebug(lcQpaWindows) << "Failed to exit full screen mode.";
             return;
         }
+        d->screen->setResizePending();
     }
 
     if (d->state & Qt::WindowMinimized || state == Qt::WindowNoState || state == Qt::WindowActive)

tests/auto/widgets/graphicsview/qgraphicsitem/BLACKLIST

@@ -1,3 +0,0 @@
-[cursor]
-# QTBUG-73545
-winrt