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<p>Hi,</p>
<p>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.</p>
<p>Can anyone tell me how I can add the variables to the expression
dialog?</p>
<p>Regards,<br>
Simon<br>
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