QQuickItemGrabResult: mark saveToFile() as const

This method does not modify the object.
Can't change the API, so overload and mark the old function
for removal in Qt 6.

Change-Id: I435af6785b765efb68037dd3fcdc9cbf56aec6da
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 15 insertions, 2 deletions

diff --git a/src/quick/items/qquickitemgrabresult.cpp b/src/quick/items/qquickitemgrabresult.cpp
index 0db5323863..6865ee2654 100644
--- a/src/quick/items/qquickitemgrabresult.cpp
+++ b/src/quick/items/qquickitemgrabresult.cpp
@@ -180,13 +180,26 @@ QQuickItemGrabResult::QQuickItemGrabResult(QObject *parent)
 /*!
  * Saves the grab result as an image to \a fileName. Returns true
  * if successful; otherwise returns false.
+ *
+ * \note In Qt versions prior to 5.9, this function is marked as non-\c{const}.
  */
-bool QQuickItemGrabResult::saveToFile(const QString &fileName)
+bool QQuickItemGrabResult::saveToFile(const QString &fileName) const
 {
-    Q_D(QQuickItemGrabResult);
+    Q_D(const QQuickItemGrabResult);
     return d->image.save(fileName);
 }
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+/*!
+ * \overload
+ * \internal
+ */
+bool QQuickItemGrabResult::saveToFile(const QString &fileName)
+{
+    return qAsConst(*this).saveToFile(fileName);
+}
+#endif // < Qt 6
+
 QUrl QQuickItemGrabResult::url() const
 {
     Q_D(const QQuickItemGrabResult);