Fix recursive onchange misbehavior & tests.

partner_firstname/models.py

@@ -96,11 +96,28 @@ class ResPartner(models.Model):
         if not (self.firstname or self.lastname):
             raise exceptions.EmptyNamesError(self)
 
+    @api.one
+    @api.onchange("firstname", "lastname")
+    def _onchange_subnames(self):
+        """Avoid recursion when the user changes one of these fields.
+
+        This forces to skip the :attr:`~.name` inversion when the user is
+        setting it in a not-inverted way.
+        """
+        # Modify self's context without creating a new Environment.
+        # See https://github.com/odoo/odoo/issues/7472#issuecomment-119503916.
+        self.env.context = self.with_context(skip_onchange=True).env.context
+
     @api.one
     @api.onchange("name")
     def _onchange_name(self):
         """Ensure :attr:`~.name` is inverted in the UI."""
-        self._inverse_name_after_cleaning_whitespace()
+        if self.env.context.get("skip_onchange"):
+            # Do not skip next onchange
+            self.env.context = (
+                self.with_context(skip_onchange=False).env.context)
+        else:
+            self._inverse_name_after_cleaning_whitespace()
 
     @api.model
     def _install_partner_firstname(self):

partner_firstname/tests/test_onchange.py

@@ -19,7 +19,7 @@ class PartnerCompanyCase(TransactionCase):
             # User ensures it is a company
             partner.is_company = True
 
-            # User sets a name, that triggers ``_onchange_name()``
+            # User sets a name, which triggers onchanges
             partner.name = name
             partner._onchange_name()
 
@@ -39,8 +39,9 @@ class PartnerContactCase(TransactionCase):
             # User ensures it is not a company
             partner.is_company = False
 
-            # Changes firstname, which triggers _onchange_name()
+            # Changes firstname, which triggers onchanges
             partner.firstname = firstname
+            partner._onchange_subnames()
             partner._onchange_name()
 
             self.assertEqual(partner.lastname, False)
@@ -57,8 +58,9 @@ class PartnerContactCase(TransactionCase):
             # User ensures it is not a company
             partner.is_company = False
 
-            # Changes lastname, which triggers _onchange_name()
+            # Changes lastname, which triggers onchanges
             partner.lastname = lastname
+            partner._onchange_subnames()
             partner._onchange_name()
 
             self.assertEqual(partner.firstname, False)
@@ -76,14 +78,16 @@ class PartnerContactCase(TransactionCase):
             # User ensures it is not a company
             partner.is_company = False
 
-            # Changes firstname, which triggers _onchange_name()
+            # Changes firstname, which triggers onchanges
             partner.firstname = firstname
+            partner._onchange_subnames()
             partner._onchange_name()
 
-            # Changes lastname, which triggers _onchange_name()
+            # Changes lastname, which triggers onchanges
             partner.lastname = lastname
+            partner._onchange_subnames()
             partner._onchange_name()
 
             self.assertEqual(partner.lastname, lastname)
             self.assertEqual(partner.firstname, firstname)
-            self.assertEqual(partner.name, u" ".join(lastname, firstname))
+            self.assertEqual(partner.name, u" ".join((lastname, firstname)))