QGIS QgsLayerTreeGroup signal "currentLayerChanged"?

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In a pyqgis context, I use the "currentLayerChanged(QgsMapLayer *)" signal of the QgisInterface class to do something when the current layer is changed, but I need now to do the same when I select a group, not a layer. The class QgsLayerTreeGroup derives from QgsLayerTreeNode who has signals reflecting a change in structure, or a change in active/inactive and expanded/collapsed, but no selection signal.Is there a way to do that ?

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