qgis - Multiple styles using pyqgis

I'm trying to automate adding styles to layers, with each layer having multiple styles using pyqgis.

Couldn't find any answers except this unanswered question:

Adding multiple styles to single layer with pyQGIS?

I did manage to add multiple styles using QgsMapLayerStyleManager:

layer = iface.activeLayer()
layer.name()

mlsm = QgsMapLayerStyleManager(layer)
layer.loadNamedStyle('~/Styles/BasinAnalysis/Area/Total.qml')
mlsm.renameStyle("default","Area-Total")
mlsm.addStyleFromLayer("Area-Freshwater")
layer.loadNamedStyle('~/Styles/BasinAnalysis/Area/Freshwater.qml')
mlsm.addStyleFromLayer("Area-Unirrigated")
layer.loadNamedStyle('~/Styles/BasinAnalysis/Area/Unirrigated.qml')
etc...

It seems like the multiple styles are associated to layer, and I can also see the changes applies to layer:

mlsm.styles()
>>> ['Area-Freshwater', 'Area-Other', 'Area-Saline', 'Area-TWW', 'Area-Total', 'Area-Unirrigated']

The problem is that styles don't appear when I right click on Layer -> Styles, it only shows the default layer.

I'm guessing I need to associate the styles from the StyleManager back to the layer, but not sure how.

Answer

You should obtain the style manager from layer instead of creating new one. You can do this with:

layer.styleManager()

You can read more in QGIS documentation: https://qgis.org/api/classQgsMapLayer.html#ac7ce04c009ac81926b63af4c98bd5c72