Override v7 onchange and add extra parameters

Question

I need to override
onchange_picking_type(picking_type_id,partner_id)  from stock.view_picking_form.
But I need to have the selected carrier_id as well in the parameters to do something with it.
How can I do that?
I can't use the new @api.onchange when there is already an existing v7 method in parent module because Odoo doesn't want to support that (very frustrating). They apparently live in a world we everything is in V8! Ok I feel better now...
I tried to do that in inherited view. It doesn't s

Mathieu Laflamme · Answer

Ok so the issue is really the warning module that screw everything up.

To correct the problem, the warning module should be fixed. Instead of overriding onchange_picking_type [or call it from onchange_partner_id(partner_id)] , warning module is redefining the on_change attribute in the view which mute the original on_change:

<field name="partner_id" position="attributes">
    <attribute name="on_change">onchange_partner_id(partner_id)</attribute>
</field>

Odoo team will most likely fix it in the next days... \https://github.com/odoo/odoo/issues/11342

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