gw-list-field-as-choices.php: Add gwlfac_list_field_values
filter to allow filtering the List field values that will be used to populate choices.
#502
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Context
gravity-forms/gw-list-field-as-choices
Summary
The current logic does not allow the $values array to be customized/populated from additional sources that in-progress initial form submission. The PR filter adds support for scenarios involving an existing entry or value array customization. The usage example shows how it can be used with an existing entry via a Gravity Flow User Input step.