Lock table at transaction start for with_transaction decorator

Since c8771e45b861 TransactionError is raised if a table is not locked at the
transaction start. The decorator must manage such exception in case the
decorated route needs to lock a table.

Closes #12962
(grafted from bced72f6282bbb1ec2c58e7af25ca1e5a941b82f)

--HG--
branch : 7.0

trytond/trytond/protocols/wrappers.py

@@ -24,7 +24,7 @@ from trytond.config import config
 from trytond.exceptions import RateLimitException, UserError, UserWarning
 from trytond.pool import Pool
 from trytond.tools import cached_property
-from trytond.transaction import Transaction, check_access
+from trytond.transaction import Transaction, TransactionError, check_access
 
 __all__ = [
     'HTTPStatus',
@@ -235,17 +235,24 @@ def with_transaction(readonly=None, user=0, context=None):
             else:
                 user_ = user
             retry = config.getint('database', 'retry')
-            for count in range(retry, -1, -1):
-                if count != retry:
+            count = 0
+            transaction_extras = {}
+            while True:
+                if count:
                     time.sleep(0.02 * (retry - count))
                 with Transaction().start(
                         pool.database_name, user_, readonly=readonly_,
-                        context=context_) as transaction:
+                        context=context_, **transaction_extras) as transaction:
                     try:
                         result = func(request, pool, *args, **kwargs)
+                    except TransactionError as e:
+                        transaction.rollback()
+                        e.fix(transaction_extras)
+                        continue
                     except backend.DatabaseOperationalError:
-                        if count and not readonly_:
+                        if count < retry and not readonly_:
                             transaction.rollback()
+                            count += 1
                             continue
                         raise
                     # Need to commit to unlock SQLite database