[FIX] base: allow to duplicate an External ID

Before this commit, the ir_model_data_module_name_uniq_index constraints avoid
to duplicate an XML ID.

Now on copy, we add a random suffix to allow the end user to update just the
record id (and rename the name).

closes odoo/odoo#92108

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

odoo/addons/base/models/ir_model.py

@@ -2,6 +2,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 import itertools
 import logging
+import random
 import re
 import psycopg2
 from ast import literal_eval
@@ -1959,6 +1960,13 @@ class IrModelData(models.Model):
             raise AccessError(_('Not enough access rights on the external ID:') + ' %s.%s' % (module, xml_id))
         return model, False
 
+    @api.returns('self', lambda value: value.id)
+    def copy(self, default=None):
+        self.ensure_one()
+        rand = "%04x" % random.getrandbits(16)
+        default = dict(default or {}, name="%s_%s" % (self.name, rand))
+        return super().copy(default)
+
     def unlink(self):
         """ Regular unlink method, but make sure to clear the caches. """
         self.clear_caches()