Bug 2941: Remove forward declarations of QModelIndex and #include <QModelIndex.h>. The QList template argument needs the full declaration of QModelIndex.
<layers>
<visual>
<param name="opacity" type="anim">
<duration>0.3</duration>
<style>linear</style>
<keyframe at="0.0">0</keyframe>
<keyframe at="0.5">0.25</keyframe>
<keyframe at="1.0">1</keyframe>
</param>
</visual>
</layers>