QScxmlEventConnection: fix binding loops

By using (set)ValueBypassingBindings() in property setters.
Also convert the helper function doConnect() to use
valueBypassingBindings(), as it's only called from the setters.

Task-number: QTBUG-116542
Pick-to: 6.5
Change-Id: I6ab241c26d377b62e99b46b3295cfa48ef5f2a7b
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
(cherry picked from commit d86fa5e76b2f13633bc557579bde5f0dcc36ab76)
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

1 files changed, 12 insertions, 11 deletions

diff --git a/src/scxmlqml/eventconnection.cpp b/src/scxmlqml/eventconnection.cpp
index 4171438..f3c7589 100644
--- a/src/scxmlqml/eventconnection.cpp
+++ b/src/scxmlqml/eventconnection.cpp
@@ -56,11 +56,11 @@ QStringList QScxmlEventConnection::events() const
 
 void QScxmlEventConnection::setEvents(const QStringList &events)
 {
-    if (events == m_events.value()) {
-        m_events.removeBindingUnlessInWrapper();
+    m_events.removeBindingUnlessInWrapper();
+    if (events == m_events.valueBypassingBindings()) {
         return;
     }
-    m_events = events;
+    m_events.setValueBypassingBindings(events);
     doConnect();
     m_events.notify();
 }
@@ -77,11 +77,10 @@ QScxmlStateMachine *QScxmlEventConnection::stateMachine() const
 
 void QScxmlEventConnection::setStateMachine(QScxmlStateMachine *stateMachine)
 {
-    if (stateMachine == m_stateMachine.value()) {
-        m_stateMachine.removeBindingUnlessInWrapper();
+    m_stateMachine.removeBindingUnlessInWrapper();
+    if (stateMachine == m_stateMachine.valueBypassingBindings())
         return;
-    }
-    m_stateMachine = stateMachine;
+    m_stateMachine.setValueBypassingBindings(stateMachine);
     doConnect();
     m_stateMachine.notify();
 }
@@ -96,10 +95,12 @@ void QScxmlEventConnection::doConnect()
     for (const QMetaObject::Connection &connection : std::as_const(m_connections))
         disconnect(connection);
     m_connections.clear();
-    if (m_stateMachine) {
-        for (const QString &event : std::as_const(m_events.value())) {
-            m_connections.append(m_stateMachine->connectToEvent(event, this,
-                                                                &QScxmlEventConnection::occurred));
+    const auto stateMachine = m_stateMachine.valueBypassingBindings();
+    if (stateMachine) {
+        const auto events = m_events.valueBypassingBindings();
+        for (const QString &event : events) {
+            m_connections.append(stateMachine->connectToEvent(event, this,
+                                                              &QScxmlEventConnection::occurred));
         }
     }
 }