Fix softkeys cleanup

QSoftKeyManager's keyedActions and softKeyCommandActions hashes were
not properly cleaned up, resulting in randomly incorrect softkeys
as already deleted cached actions were assigned to softkeys if the
new action happened to be in the same address as the previously deleted
action.

Two bugs related to this were fixed:

1) qobject_cast can't be used in "destroyed" signal handler, as the
   cast will return NULL pointer in this case. Changed the cast to
   static_cast, which is safe here as the pointer is only used as a
   hash key.

2) If softkey action was created with QSoftKeyManager::createAction
   instead of QSoftKeyManager::createKeyedAction, the "destroyed"
   signal was not connected to cleanupHash slot, leaving such
   actions in softKeyCommandActions hash after deletion. Ensured
   the signal was connected properly in both cases.

Task-number: QTTH-1442, QTBUG-20214
Reviewed-by: Gareth Stockwell
(cherry picked from commit 1dc0a2ccd645abd26b13fd67313a03bbc722a74d)

Reapplied after bad v4.7.4 merge

1 files changed, 12 insertions, 2 deletions

diff --git a/src/gui/kernel/qsoftkeymanager.cpp b/src/gui/kernel/qsoftkeymanager.cpp
index 2700bbba25..80e6ec603d 100644
--- a/src/gui/kernel/qsoftkeymanager.cpp
+++ b/src/gui/kernel/qsoftkeymanager.cpp
@@ -126,8 +126,10 @@ QAction *QSoftKeyManager::createAction(StandardSoftKey standardKey, QWidget *act
     default:
         break;
     };
-    if (key != 0)
+    if (key != 0) {
         QSoftKeyManager::instance()->d_func()->softKeyCommandActions.insert(action, key);
+        connect(action, SIGNAL(destroyed(QObject*)), QSoftKeyManager::instance(), SLOT(cleanupHash(QObject*)));
+    }
 #endif
     QAction::SoftKeyRole softKeyRole = QAction::NoSoftKey;
     switch (standardKey) {
@@ -160,7 +162,13 @@ QAction *QSoftKeyManager::createKeyedAction(StandardSoftKey standardKey, Qt::Key
     QScopedPointer<QAction> action(createAction(standardKey, actionWidget));
 
     connect(action.data(), SIGNAL(triggered()), QSoftKeyManager::instance(), SLOT(sendKeyEvent()));
+
+#if defined(Q_WS_S60) && !defined(SYMBIAN_VERSION_9_4) && !defined(SYMBIAN_VERSION_9_3) && !defined(SYMBIAN_VERSION_9_2)
+    // Don't connect destroyed slot if is was already connected in createAction
+    if (!(QSoftKeyManager::instance()->d_func()->softKeyCommandActions.contains(action.data())))
+#endif
     connect(action.data(), SIGNAL(destroyed(QObject*)), QSoftKeyManager::instance(), SLOT(cleanupHash(QObject*)));
+
     QSoftKeyManager::instance()->d_func()->keyedActions.insert(action.data(), key);
     return action.take();
 #endif //QT_NO_ACTION
@@ -169,7 +177,9 @@ QAction *QSoftKeyManager::createKeyedAction(StandardSoftKey standardKey, Qt::Key
 void QSoftKeyManager::cleanupHash(QObject *obj)
 {
     Q_D(QSoftKeyManager);
-    QAction *action = qobject_cast<QAction*>(obj);
+    // Can't use qobject_cast in destroyed() signal handler as that'll return NULL,
+    // so use static_cast instead. Since the pointer is only used as a hash key, it is safe.
+    QAction *action = static_cast<QAction *>(obj);
     d->keyedActions.remove(action);
 #if defined(Q_WS_S60) && !defined(SYMBIAN_VERSION_9_4) && !defined(SYMBIAN_VERSION_9_3) && !defined(SYMBIAN_VERSION_9_2)
     d->softKeyCommandActions.remove(action);