res_partner_views.xml

<?xml version="1.0" ?>
<!-- Copyright 2020 Le Filament
     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
<odoo>
    <data>

        <record id="view_res_partner_filter" model="ir.ui.view">
            <field name="name">res.partner.search</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_res_partner_filter" />
            <field name="arch" type="xml">
                <xpath expr="//filter[@name='type_company']" position="after">
                    <separator />
                    <filter
                        string="Porteurs de projets"
                        name="filt_porteurs"
                        domain="[('project_count', '>', 0)]"
                    />
                </xpath>
            </field>
        </record>

        <record id="view_partner_form" model="ir.ui.view">
            <field name="name">view.partner.form.inherit</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form" />
            <field name="arch" type="xml">
                <button name="toggle_active" position="before">
                    <button
                        class="oe_stat_button"
                        type="object"
                        name="action_view_partner_projects"
                        icon="fa-puzzle-piece"
                        attrs="{'invisible': [('project_count', '=', 0)]}"
                    >
                        <field
                            string="Projects"
                            name="project_count"
                            widget="statinfo"
                        />
                    </button>
                </button>
            </field>
        </record>
    </data>
</odoo>