QAction: add QT_DEPRECATED_VERSION_6_0 to deprecated methods

And fix all the new warnings.

Task-number: QTBUG-104857
Change-Id: I2a5791f495575d71d2344429aca3363f9922e31b
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
(cherry picked from commit 4b9c738185c771127eb8e7c73868f60bd31f7fce)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/gui/kernel/qaction.cpp

@@ -514,14 +514,14 @@ QList<QObject*> QAction::associatedObjects() const
 
 /*!
     \fn QWidget *QAction::parentWidget() const
-    \deprecated Use parent() with qobject_cast() instead.
+    \deprecated [6.0] Use parent() with qobject_cast() instead.
 
     Returns the parent widget.
 */
 
 /*!
     \fn QList<QWidget*> QAction::associatedWidgets() const
-    \deprecated Use associatedObjects() with qobject_cast() instead.
+    \deprecated [6.0] Use associatedObjects() with qobject_cast() instead.
 
     Returns a list of widgets this action has been added to.
 
@@ -530,7 +530,7 @@ QList<QObject*> QAction::associatedObjects() const
 
 /*!
     \fn QList<QWidget*> QAction::associatedGraphicsWidgets() const
-    \deprecated Use associatedObjects() with qobject_cast() instead.
+    \deprecated [6.0] Use associatedObjects() with qobject_cast() instead.
 
     Returns a list of graphics widgets this action has been added to.
 

src/gui/kernel/qaction.h

@@ -84,6 +84,7 @@ public:
         QWidget, QMenu, and QGraphicsWidget can be expected to be fully defined.
     */
     template<typename T = QWidget*>
+    QT_DEPRECATED_VERSION_X_6_0("Use parent() with qobject_cast() instead")
     T parentWidget() const
     {
         auto result = parent();
@@ -93,6 +94,7 @@ public:
     }
 
     template<typename T = QWidget*>
+    QT_DEPRECATED_VERSION_X_6_0("Use associatedObjects() with qobject_cast() instead")
     QList<T> associatedWidgets() const
     {
         QList<T> result;
@@ -102,6 +104,7 @@ public:
         return result;
     }
     template<typename T = QGraphicsWidget*>
+    QT_DEPRECATED_VERSION_X_6_0("Use associatedObjects() with qobject_cast() instead")
     QList<T> associatedGraphicsWidgets() const
     {
         QList<T> result;

src/widgets/widgets/qmenu.cpp

@@ -215,13 +215,21 @@ void QMenuPrivate::syncPlatformMenu()
     platformMenu->setEnabled(q->isEnabled());
 }
 
+static QWidget *getParentWidget(const QAction *action)
+{
+    auto result = action->parent();
+    while (result && !qobject_cast<QWidget *>(result))
+        result = result->parent();
+    return static_cast<QWidget *>(result);
+}
+
 void QMenuPrivate::copyActionToPlatformItem(const QAction *action, QPlatformMenuItem *item)
 {
     item->setText(action->text());
     item->setIsSeparator(action->isSeparator());
     if (action->isIconVisibleInMenu()) {
         item->setIcon(action->icon());
-        if (QWidget *w = action->parentWidget()) {
+        if (QWidget *w = getParentWidget(action)) {
             QStyleOption opt;
             opt.initFrom(w);
             item->setIconSize(w->style()->pixelMetric(QStyle::PM_SmallIconSize, &opt, w));

tests/auto/widgets/widgets/qlineedit/tst_qlineedit.cpp

@@ -4671,7 +4671,7 @@ void tst_QLineEdit::sideWidgets()
 
 template <class T> T *findAssociatedWidget(const QAction *a)
 {
-    foreach (QWidget *w, a->associatedWidgets()) {
+    foreach (QObject *w, a->associatedObjects()) {
         if (T *result = qobject_cast<T *>(w))
             return result;
     }