1 files changed, 3 insertions, 1 deletions
diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp
index d9e0eecc00..69e08d120b 100644
--- a/src/gui/graphicsview/qgraphicsscene.cpp
+++ b/src/gui/graphicsview/qgraphicsscene.cpp
@@ -4945,9 +4945,11 @@ void QGraphicsScenePrivate::drawItemHelper(QGraphicsItem *item, QPainter *painte
             if (newCacheIndent != deviceData->cacheIndent || deviceRect.size() != pix.size()) {
                 QPoint diff = newCacheIndent - deviceData->cacheIndent;
                 QPixmap newPix(deviceRect.size());
+                // ### Investigate removing this fill (test with Plasma and
+                // graphicssystem raster).
+                newPix.fill(Qt::transparent);
                 if (!pix.isNull()) {
                     QPainter newPixPainter(&newPix);
-                    newPixPainter.setCompositionMode(QPainter::CompositionMode_Source);
                     newPixPainter.drawPixmap(-diff, pix);
                     newPixPainter.end();
                 }