Remove tst_QWidget::immediateRepaintAfterShow().

It tested whether a paint event was received when calling QWidget::repaint()
right after QWidget::show() without waiting for the window to be exposed.

This caused a QEvent::UpdateRequest to be sent, which ended up in
QWidgetBackingStore::sync() which returns after checking
QWidgetBackingStore::discardSyncRequest(), since Qt::WA_Mapped is not set
on the non-exposed widget.

The test passed on Windows since it contains one call to
QCoreApplication::processEvents() which causes the the initial WM_PAINT
message to be processed in QWindowsWindow::handleWmPaint() which calls
QWindowSystemInterface::flushWindowSystemEvents() and causes Qt::WA_Mapped
to be set. This seems counter to the intention of the test.

Remove the test since it won't pass anymore in Qt 5 unless Qt::WA_Mapped is set.

Task-number: QTBUG-26424
Task-number: QTBUG-38327
Task-number: QTBUG-39842
Change-Id: Iede026d52825dcf1f2e9014a316d26d260309214
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

1 files changed, 0 insertions, 20 deletions

diff --git a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
index 10d32472be..b7c152603c 100644
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@@ -378,7 +378,6 @@ private slots:
     void setMaskInResizeEvent();
     void moveInResizeEvent();
 
-    void immediateRepaintAfterShow();
     void immediateRepaintAfterInvalidateBuffer();
 
     void effectiveWinId();
@@ -8145,25 +8144,6 @@ void tst_QWidget::moveInResizeEvent()
     QTRY_COMPARE(testWidget.geometry(), expectedGeometry);
 }
 
-void tst_QWidget::immediateRepaintAfterShow()
-{
-    if (m_platform == QStringLiteral("xcb"))
-        QSKIP("QTBUG-26424");
-    if (m_platform != QStringLiteral("xcb") && m_platform != QStringLiteral("windows"))
-        QSKIP("We don't support immediate repaint right after show on other platforms.");
-
-    UpdateWidget widget;
-    centerOnScreen(&widget);
-    widget.show();
-    qApp->processEvents();
-    // On X11 in particular, we are now waiting for a MapNotify event before
-    // syncing the backing store. However, if someone request a repaint()
-    // we must repaint immediately regardless of the current state.
-    widget.numPaintEvents = 0;
-    widget.repaint();
-    QCOMPARE(widget.numPaintEvents, 1);
-}
-
 void tst_QWidget::immediateRepaintAfterInvalidateBuffer()
 {
     if (m_platform != QStringLiteral("xcb") && m_platform != QStringLiteral("windows"))