QProperty: Allow manual scheduling of binding notification

In some situation we want to notify even if the value didn't change.

Task-number: QTBUG-101771
Pick-to: 6.2 6.3
Change-Id: I7d82a9f6e0f7d5eb48065e3f428b814939181ea8
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp b/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp
index 877896407a..0f89ccee8b 100644
--- a/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp
+++ b/tests/auto/corelib/kernel/qproperty/tst_qproperty.cpp
@@ -118,6 +118,7 @@ private slots:
     void selfBindingShouldNotCrash();
 
     void qpropertyAlias();
+    void scheduleNotify();
 };
 
 void tst_QProperty::functorBinding()
@@ -2015,6 +2016,21 @@ void tst_QProperty::qpropertyAlias()
     QVERIFY(!alias.isValid());
 }
 
+void tst_QProperty::scheduleNotify()
+{
+    int notifications = 0;
+    QProperty<int> p;
+    QCOMPARE(p.value(), 0);
+    const auto handler = p.addNotifier([&](){ ++notifications; });
+    QCOMPARE(notifications, 0);
+    QPropertyBinding<int> b([]() { return 0; }, QPropertyBindingSourceLocation());
+    QPropertyBindingPrivate::get(b)->scheduleNotify();
+    QCOMPARE(notifications, 0);
+    p.setBinding(b);
+    QCOMPARE(notifications, 1);
+    QCOMPARE(p.value(), 0);
+}
+
 QTEST_MAIN(tst_QProperty);
 
 #undef QT_SOURCE_LOCATION_NAMESPACE