Fix handling of QQuickViewPrivate::root

QQuickView is supposed to own the root item and shall also track it for
external deletion. Therefore, when we assign a new root item we need to
delete the old one. There is no point in setting a QPointer to nullptr
after deleting it. It will do that by itself. When we fail to assign a
new item, we should _not_ automatically delete the new one. Calling code
typically does not expect the argument to a set* call to be deleted
right away. Rather, return a boolean indicating whether we have
successfully set the root object. This can then be used to get rid of
the object if necessary.

Coverity-Id: 218729
Change-Id: I79ed37d22d304bcc6d4e3c956b83a65fe157dfe0
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
(cherry picked from commit a64ee3a2481499f856d0f3fbc697399e0df1e8f8)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/quick/items/qquickview_p.h b/src/quick/items/qquickview_p.h
index b1ab8d8e8c..1bc266bbbf 100644
--- a/src/quick/items/qquickview_p.h
+++ b/src/quick/items/qquickview_p.h
@@ -91,7 +91,7 @@ public:
     void itemGeometryChanged(QQuickItem *item, QQuickGeometryChange change, const QRectF &) override;
     void initResize();
     void updateSize();
-    void setRootObject(QObject *);
+    bool setRootObject(QObject *);
 
     void init(QQmlEngine* e = nullptr);