QPauseAnimation: extend tests and fix binding loop

Extend the unit-tests for bindable properties and fix the discovered
binding loop by using {set}ValueBypassingBindings() in the setter of
the duration property.

The code refactoring does not modify the setter logic, because
previously the binding was anyway implicitly removed when calling the
assignment operator. The updated code just does it explicitly.

Task-number: QTBUG-116346
Pick-to: 6.6 6.5
Change-Id: I0f339d182efb60500ee7f12e407f200d739da312
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

3 files changed, 11 insertions, 4 deletions

diff --git a/src/corelib/animation/qpauseanimation.cpp b/src/corelib/animation/qpauseanimation.cpp
index eb1e6c3c81..344b21946e 100644
--- a/src/corelib/animation/qpauseanimation.cpp
+++ b/src/corelib/animation/qpauseanimation.cpp
@@ -94,11 +94,10 @@ void QPauseAnimation::setDuration(int msecs)
     }
     Q_D(QPauseAnimation);
 
-    if (msecs != d->duration) {
-        d->duration = msecs;
+    d->duration.removeBindingUnlessInWrapper();
+    if (msecs != d->duration.valueBypassingBindings()) {
+        d->duration.setValueBypassingBindings(msecs);
         d->duration.notify();
-    } else {
-        d->duration.removeBindingUnlessInWrapper();
     }
 }
 
diff --git a/tests/auto/corelib/animation/qpauseanimation/CMakeLists.txt b/tests/auto/corelib/animation/qpauseanimation/CMakeLists.txt
index 227dc998e4..aa0cb1edc5 100644
--- a/tests/auto/corelib/animation/qpauseanimation/CMakeLists.txt
+++ b/tests/auto/corelib/animation/qpauseanimation/CMakeLists.txt
@@ -16,4 +16,5 @@ qt_internal_add_test(tst_qpauseanimation
         tst_qpauseanimation.cpp
     LIBRARIES
         Qt::CorePrivate
+        Qt::TestPrivate
 )
diff --git a/tests/auto/corelib/animation/qpauseanimation/tst_qpauseanimation.cpp b/tests/auto/corelib/animation/qpauseanimation/tst_qpauseanimation.cpp
index 53c80ef71f..90357ef477 100644
--- a/tests/auto/corelib/animation/qpauseanimation/tst_qpauseanimation.cpp
+++ b/tests/auto/corelib/animation/qpauseanimation/tst_qpauseanimation.cpp
@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
 #include <QTest>
+#include <QtTest/private/qpropertytesthelper_p.h>
 
 #include <QtCore/qpauseanimation.h>
 #include <QtCore/qpropertyanimation.h>
@@ -456,6 +457,12 @@ void tst_QPauseAnimation::bindings()
                          "QPauseAnimation::setDuration: cannot set a negative duration");
     animation.setDuration(-1);
     QCOMPARE(durationObserver, 46);
+
+    QTestPrivate::testReadWritePropertyBasics(animation, 10, 20, "duration");
+    if (QTest::currentTestFailed()) {
+        qDebug("Failed property test for QPauseAnimation::duration");
+        return;
+    }
 }
 
 QTEST_MAIN(tst_QPauseAnimation)