Fix users not being able to create companies.

This happened because the invert method was not being called when using
the UI, and because lastname & firstname fields were required while
hidden.

partner_firstname/models.py

@@ -96,6 +96,12 @@ class ResPartner(models.Model):
         if not (self.firstname or self.lastname):
             raise exceptions.EmptyNamesError(self)
 
+    @api.one
+    @api.onchange("name")
+    def _onchange_name(self):
+        """Ensure :attr:`~.name` is inverted in the UI."""
+        self._inverse_name_after_cleaning_whitespace()
+
     @api.model
     def _install_partner_firstname(self):
         """Save names correctly in the database.

partner_firstname/views/res_partner.xml

@@ -17,10 +17,12 @@
 
             <xpath expr="//field[@name='category_id']" position="before">
                 <group attrs="{'invisible': [('is_company', '=', True)]}">
-                    <field name="lastname"
-                           attrs="{'required': [('firstname', '=', False)]}"/>
-                    <field name="firstname"
-                           attrs="{'required': [('lastname', '=', False)]}"/>
+                    <field name="lastname" attrs=
+                        "{'required': [('firstname', '=', False),
+                                       ('is_company', '=', False)]}"/>
+                    <field name="firstname" attrs=
+                        "{'required': [('lastname', '=', False),
+                                       ('is_company', '=', False)]}"/>
                 </group>
             </xpath>
         </data>
@@ -42,10 +44,12 @@
 
             <xpath expr="//field[@name='category_id']" position="before">
                 <group attrs="{'invisible': [('is_company', '=', True)]}">
-                    <field name="lastname"
-                           attrs="{'required': [('firstname', '=', False)]}"/>
-                    <field name="firstname"
-                           attrs="{'required': [('lastname', '=', False)]}"/>
+                    <field name="lastname" attrs=
+                        "{'required': [('firstname', '=', False),
+                                       ('is_company', '=', False)]}"/>
+                    <field name="firstname" attrs=
+                        "{'required': [('lastname', '=', False),
+                                       ('is_company', '=', False)]}"/>
                 </group>
             </xpath>
 
@@ -54,10 +58,12 @@
                          //field[@name='category_id']"
                    position="before">
                 <group attrs="{'invisible': [('is_company', '=', True)]}">
-                    <field name="lastname"
-                           attrs="{'required': [('firstname', '=', False)]}"/>
-                    <field name="firstname"
-                           attrs="{'required': [('lastname', '=', False)]}"/>
+                    <field name="lastname" attrs=
+                        "{'required': [('firstname', '=', False),
+                                       ('is_company', '=', False)]}"/>
+                    <field name="firstname" attrs=
+                        "{'required': [('lastname', '=', False),
+                                       ('is_company', '=', False)]}"/>
                 </group>
             </xpath>