Use unique_ptr to clarify ownership of QQuickDefaultClipNode objects

The clang static analyzer warns in 3df1fff15a10a64372ed4f92ba05271f about
a potential memory leak. While that particular claim is a false positive
(the loop is always entered if sortedIndex is not empty), the re-use of
the currentClipNode variable makes it hard to follow the object ownership,
and there might still be a potential memory leak.

Use std::unique_ptr to force explicit transfer of ownership, and get
implicit destruction of objects not owned at the end of the scope.

Change-Id: If826e1d81b92f1da60aae2262b628dcaaa2e592a
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
(cherry picked from commit 02c6e7bc3aca42a188b772aa9794b919e60017e7)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/src/quick/items/qquicktextnodeengine.cpp b/src/quick/items/qquicktextnodeengine.cpp
index dd666416e8..38f199ecc0 100644
--- a/src/quick/items/qquicktextnodeengine.cpp
+++ b/src/quick/items/qquicktextnodeengine.cpp
@@ -257,7 +257,7 @@ void QQuickTextNodeEngine::processCurrentLine()
     QVarLengthArray<TextDecoration> pendingOverlines;
     QVarLengthArray<TextDecoration> pendingStrikeOuts;
     if (!sortedIndexes.isEmpty()) {
-        QQuickDefaultClipNode *currentClipNode = m_hasSelection ? new QQuickDefaultClipNode(QRectF()) : nullptr;
+        std::unique_ptr<QQuickDefaultClipNode> currentClipNode(m_hasSelection ? new QQuickDefaultClipNode(QRectF()) : nullptr);
         bool currentClipNodeUsed = false;
         for (int i=0; i<=sortedIndexes.size(); ++i) {
             BinaryTreeNode *node = nullptr;
@@ -305,7 +305,7 @@ void QQuickTextNodeEngine::processCurrentLine()
 
                 if (currentClipNode != nullptr) {
                     if (!currentClipNodeUsed) {
-                        delete currentClipNode;
+                        currentClipNode.reset();
                     } else {
                         currentClipNode->setIsRectangular(true);
                         currentClipNode->setRect(currentRect);
@@ -314,9 +314,9 @@ void QQuickTextNodeEngine::processCurrentLine()
                 }
 
                 if (node != nullptr && m_hasSelection)
-                    currentClipNode = new QQuickDefaultClipNode(QRectF());
+                    currentClipNode.reset(new QQuickDefaultClipNode(QRectF()));
                 else
-                    currentClipNode = nullptr;
+                    currentClipNode.reset(nullptr);
                 currentClipNodeUsed = false;
 
                 if (node != nullptr) {
@@ -336,7 +336,7 @@ void QQuickTextNodeEngine::processCurrentLine()
 
             if (node != nullptr) {
                 if (node->selectionState == Selected) {
-                    node->clipNode = currentClipNode;
+                    node->clipNode = currentClipNode.release();
                     currentClipNodeUsed = true;
                 }