Fix QGraphicsView::render() regression, ensure the right device is passed.

If we pass the viewport widget as the widget pointer when rendering to
an arbitrary painter (e.g., onto a pixmap), we confuse the rendering
functions to thinking that it's the viewport's region we should render
into. So instead, when drawItems() is passed a painter that's different
from the view, we pass 0 for the widget.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/gui/graphicsview/qgraphicsview.cpp b/src/gui/graphicsview/qgraphicsview.cpp
index 166bcb9..e685f9b 100644
--- a/src/gui/graphicsview/qgraphicsview.cpp
+++ b/src/gui/graphicsview/qgraphicsview.cpp
@@ -3526,8 +3526,10 @@ void QGraphicsView::drawItems(QPainter *painter, int numItems,
                               const QStyleOptionGraphicsItem options[])
 {
     Q_D(QGraphicsView);
-    if (d->scene)
-        d->scene->drawItems(painter, numItems, items, options, viewport());
+    if (d->scene) {
+        QWidget *widget = painter->device() == viewport() ? viewport() : 0;
+        d->scene->drawItems(painter, numItems, items, options, widget);
+    }
 }
 
 /*!