Fixes bug when adding the same child animation twice to the same group

The child animation was removed twice from the group because in
QAnimationGroup::insertAnimationAt the insertion in the list was done
before removing the animation.

Reviewed-by: Jan-Arve

2 files changed, 36 insertions, 1 deletions

diff --git a/src/corelib/animation/qanimationgroup.cpp b/src/corelib/animation/qanimationgroup.cpp
index f39738b..03573bb 100644
--- a/src/corelib/animation/qanimationgroup.cpp
+++ b/src/corelib/animation/qanimationgroup.cpp
@@ -164,9 +164,10 @@ void QAnimationGroup::insertAnimationAt(int index, QAbstractAnimation *animation
         return;
     }
 
-    d->animations.insert(index, animation);
     if (QAnimationGroup *oldGroup = animation->group())
         oldGroup->removeAnimation(animation);
+
+    d->animations.insert(index, animation);
     QAbstractAnimationPrivate::get(animation)->group = this;
     // this will make sure that ChildAdded event is sent to 'this'
     animation->setParent(this);
diff --git a/tests/auto/qanimationgroup/tst_qanimationgroup.cpp b/tests/auto/qanimationgroup/tst_qanimationgroup.cpp
index a7d616a..3cf5631 100644
--- a/tests/auto/qanimationgroup/tst_qanimationgroup.cpp
+++ b/tests/auto/qanimationgroup/tst_qanimationgroup.cpp
@@ -68,6 +68,7 @@ private slots:
     void statesAndSignals();
     void setParentAutoAdd();
     void beginNestedGroup();
+    void addChildTwice();
 };
 
 tst_QAnimationGroup::tst_QAnimationGroup()
@@ -343,5 +344,38 @@ void tst_QAnimationGroup::beginNestedGroup()
     }
 }
 
+void tst_QAnimationGroup::addChildTwice()
+{
+    QPropertyAnimation *subGroup;
+    QPropertyAnimation *subGroup2;
+    QAnimationGroup *parent = new QSequentialAnimationGroup();
+
+    subGroup = new QPropertyAnimation();
+    subGroup->setParent(parent);
+    parent->addAnimation(subGroup);
+    QCOMPARE(parent->animationCount(), 1);
+
+    parent->clearAnimations();
+
+    QCOMPARE(parent->animationCount(), 0);
+
+    // adding the same item twice to a group will remove the item from its current position
+    // and append it to the end
+    subGroup = new QPropertyAnimation(parent);
+    subGroup2 = new QPropertyAnimation(parent);
+
+    QCOMPARE(parent->animationCount(), 2);
+    QCOMPARE(parent->animationAt(0), subGroup);
+    QCOMPARE(parent->animationAt(1), subGroup2);
+
+    parent->addAnimation(subGroup);
+
+    QCOMPARE(parent->animationCount(), 2);
+    QCOMPARE(parent->animationAt(0), subGroup2);
+    QCOMPARE(parent->animationAt(1), subGroup);
+
+    delete parent;
+}
+
 QTEST_MAIN(tst_QAnimationGroup)
 #include "tst_qanimationgroup.moc"