Regression: QGraphicsScene::render fails to render the entire scene correctly.

This only happened with items that had either negative width or height
(boundingRect().width()|height()). Problem was that in case of not having
an exposed region (drawing items from QGraphicsScene::render), we simply
checked whether the bounding rect was empty or not. This is fine, however
we have to normalize the rect first.
(Note that QRegion::intersects(rect) always normalizes the rect, so
that's why this use case broke only when calling QGraphicsScene::render).

Auto-test included.

Task-number: QTBUG-7775
Reviewed-by: yoann

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp
index 4472272..43fa24a 100644
--- a/src/gui/graphicsview/qgraphicsscene.cpp
+++ b/src/gui/graphicsview/qgraphicsscene.cpp
@@ -4678,7 +4678,8 @@ void QGraphicsScenePrivate::drawSubtreeRecursive(QGraphicsItem *item, QPainter *
         if (widget)
             item->d_ptr->paintedViewBoundingRects.insert(widget, viewBoundingRect);
         viewBoundingRect.adjust(-1, -1, 1, 1);
-        drawItem = exposedRegion ? exposedRegion->intersects(viewBoundingRect) : !viewBoundingRect.isEmpty();
+        drawItem = exposedRegion ? exposedRegion->intersects(viewBoundingRect)
+                                 : !viewBoundingRect.normalized().isEmpty();
         if (!drawItem) {
             if (!itemHasChildren)
                 return;