[QGIS-Developer] How to set defaults to QgsProcessingParameterMultipleLayers

[C Hamilton]

I just received a request to update the Density Analysis plugin
density hash algorithms so they work with multiple layers and produce one
density map based off of multiple input layers. In the algorithm I have
replaced QgsProcessingParameterFeatureSource
with QgsProcessingParameterMultipleLayers.

Is there a way to automatically populate as default value of selected
layers in QgsProcessingParameterMultipleLayers with the selected layers or
selected groups of layers in the "Layer Panel"?  This would be incredibly
useful.

I am doing this as a QgsProcessingAlgorithm. The layerType to
QgsProcessingParameterMultipleLayers is QgsProcessing.TypeVectorPoint.

Thanks for your help.

Calvin
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