Add checking "before" as child node

qquickitem_before_paintNode returns the transform node for the rectangle
as child node. But the node has no parent. It leads to following assertion
case at QSGNode::insertChildNodeAfter(). But, I tested it in release mode,
so no assertion happened. So, Some node not be able to add group node
from this cause.

Task-number: QTBUG-56657
Change-Id: Ie032dc6c56984bcb58cfcd348ff532f56e39e5b8
Reviewed-by: Inhye Seo <inhye.seo@lge.com>
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/quick/items/qquickwindow.cpp b/src/quick/items/qquickwindow.cpp
index 7875005e2d..e19570ea03 100644
--- a/src/quick/items/qquickwindow.cpp
+++ b/src/quick/items/qquickwindow.cpp
@@ -3067,10 +3067,12 @@ void QQuickWindowPrivate::updateDirtyNode(QQuickItem *item)
 
             if (itemPriv->paintNode && itemPriv->paintNode->parent() == 0) {
                 QSGNode *before = qquickitem_before_paintNode(itemPriv);
-                if (before)
+                if (before && before->parent()) {
+                    Q_ASSERT(before->parent() == itemPriv->childContainerNode());
                     itemPriv->childContainerNode()->insertChildNodeAfter(itemPriv->paintNode, before);
-                else
+                } else {
                     itemPriv->childContainerNode()->prependChildNode(itemPriv->paintNode);
+                }
             }
         } else if (itemPriv->paintNode) {
             delete itemPriv->paintNode;