Fixed tst_qpixmap::grabWidget().

prepareToRender() might call adjustSize() resulting in the widget's size
changing, so we should make sure to call adjustSize() _before_ we decide
on the required pixmap dimensions.

Task-number: QTBUG-21402
Change-Id: Ie72b46bc8e8e22f848769f78187f47ae9f4e37d3
Reviewed-on: http://codereview.qt-project.org/4772
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

src/widgets/kernel/qwidget.cpp

@@ -5188,6 +5188,8 @@ QPixmap QWidget::grab(const QRect &rectangle)
     if (testAttribute(Qt::WA_PendingResizeEvent) || !testAttribute(Qt::WA_WState_Created))
         sendResizeEvents(this);
 
+    adjustSize();
+
     QRect r(rectangle);
     if (r.width() < 0)
         r.setWidth(width() - rectangle.x());

tests/auto/gui/image/qpixmap/qpixmap.pro

@@ -31,5 +31,3 @@ wince*: {
 }
 
 RESOURCES += qpixmap.qrc
-
-CONFIG += insignificant_test # QTBUG-21402