flectra/addons/pad_project/views/project_views.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra>
    <record id="view_task_form2_inherit_pad_project" model="ir.ui.view">
        <field name="name">project.task.form.inherit</field>
        <field name="model">project.task</field>
        <field name="inherit_id" ref="project.view_task_form2"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='description']" position="attributes">
                <attribute name="attrs">{'invisible': [('use_pad', '=', True)], 'readonly': [('use_pad', '=', True)]}</attribute>
            </xpath>
            <field name="description" position="after">
                <field name="use_pad" invisible="1"/>
                <field name="description_pad" widget="pad" attrs="{'invisible': [('use_pad', '=', False)], 'readonly': [('use_pad', '=', False)]}"/>
            </field>
        </field>
    </record>

    <record id="project_project_view_form" model="ir.ui.view">
        <field name="name">project.project.view.form</field>
        <field name="model">project.project</field>
        <field name="inherit_id" ref="project.edit_project"/>
        <field name="arch" type="xml">
            <field name="partner_id" position="after">
                <field name="use_pads"/>
            </field>
        </field>
    </record>

</flectra>