Hello I'm trying to change the rendering order for the layers in the canvas with the aid of QgsLayerTree. The code grabs each layer, checks whether is a QgsMapLayer instance, and generates a reordered list (layersII). Then, the code executes: QgsLayerTree().setCustomLayerOrder(layersII) but nothing happens and print (QgsLayerTree().hasCustomLayerOrder()) returns False. The API documentation (https://qgis.org/pyqgis/master/core/QgsLayerTree.html) indicates that customLayerOrder will only be used when hasCustomLayerOrder is True. I'm missing something here but after browsing and googling, I just haven't figured out how to make the change in rendering order active. Thanks.
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