[QGIS-Developer] Enable variables in QgsPropertyOverrideButton with python

[Simon Gröchenig]

Hi,

I want to add a QgsPropertyOverrideButton to define a expression to 
filter features in a python plugin. Specifically, I want to filter the 
features using the @altas_feature variable. However, all variables are 
missing in the expression dialog.

Can anyone tell me how I can add the variables to the expression dialog?

Regards,
Simon

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