Fix pasting effect with keyframes partially broken

src/effects/effectstack/model/effectstackmodel.cpp

@@ -346,6 +346,7 @@ bool EffectStackModel::fromXml(const QDomElement &effectsXml, Fun &undo, Fun &re
                 int currentDuration = pCore->getItemDuration(m_ownerId);
                 if (currentDuration > 1) {
                     currentDuration--;
+                    currentDuration += currentIn;
                 }
                 QString pValue = KeyframeModel::getAnimationStringWithOffset(effect, pnode.text(), currentIn - parentIn, currentDuration);
                 parameters.append(QPair<QString, QVariant>(pName, QVariant(pValue)));