To not be needed to check for all the widget values in the form, the mCurrentFormFeature is introduced that contains all the values that are received on change of the widget values.
Resolves#37678
instead of QgsAttributeForm - because it's used on places not including QgsAttributeForm
now it's able to use @form_mode in expressions of containers and QML widgets
The value relation widget filter expression can now use two
new functions/variables that have access to the current
values and geometry of the form being edited.
This allows for dynamic filtering (drill-down) as explained
in the crowdfunding page:
https://north-road.com/drill-down-cascading-forms/
The new functions/variables are:
Function:
get_current_form_field_value( 'FIELD_NAME' )
Variable:
@current_form_geometry
