Fill code compact in party identifier history table

Closes #14983
(grafted from 0d8ca8201d1b54f4f34fb27992b31ce15b276ad2)

--HG--
branch : 8.0

modules/account_invoice_history/party.py

@@ -1,6 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 from trytond.pool import PoolMeta
+from trytond.transaction import Transaction
 
 
 class Party(metaclass=PoolMeta):
@@ -16,3 +17,19 @@ class Address(metaclass=PoolMeta):
 class Identifier(metaclass=PoolMeta):
     __name__ = 'party.identifier'
     _history = True
+
+    @classmethod
+    def __register__(cls, module_name):
+        cursor = Transaction().connection.cursor()
+        table = cls.__table_history__()
+        table_h = cls.__table_handler__(module_name=module_name, history=True)
+
+        fill_code_compact = (
+            table_h.column_exist('code')
+            and not table_h.column_exist('code_compact'))
+
+        super().__register__(module_name)
+
+        # Migration from 7.8: Fill code_compact
+        if fill_code_compact:
+            cursor.execute(*table.update([table.code_compact], [table.code]))