Current behaviour:
In the Calendar view (day/week/month scale), when the user's timezone observes a DST transition that starts exactly at local midnight (e.g. Africa/Cairo, since 2023), the day column right after the transition gets the wrong weekday name, duplicating the previous day's name. For ex. it renders "... THU THU FRI ..." instead of "... THU FRI SAT ...", for the week surrounding April 30th 2027.

To fix this we add 1 hour to the Date before reading its weekday/day from it, mirroring the workaround FullCalendar itself adopted for this same bug. It has no effect on any ordinary day (adding 1h to a correct local midnight stays within the same calendar day), and it cannot overshoot into the next day since no real-world DST gap exceeds that margin.

Note: This is a known bug (https://github.com/fullcalendar/fullcalendar/issues/7633), fixed in FullCalendar v6.1.17, a major version ahead of the v4.4.0, so the fix can't be applied directly without a full library upgrade.

opw-6370140

Forward-Port-Of: odoo/odoo#280253
Forward-Port-Of: odoo/odoo#279343

**Steps to reproduce:**
  * Set up a French company and configure Peppol E-invoicing.
  * Install `account_edi_ubl_cii` module.
  * Create a company partner (customer) and set a **Reference** value on the company contact under 
     **Customer** -> **Settings** -> **Sales and Purchase**.
  * Create a child contact under that company and set a different Reference value.
  * Create an invoice using the child contact as the invoice partner and confirm the invoice.
  * Send it via Peppol.

**Observed Behaviour:**
  * The BuyerReference in the generated XML contains the reference of the parent
  (commercial partner) Instead of the child contact used on the invoice.

**Cause:**
  * The buyer reference was taken from the commercial partner instead of the
  invoice partner.

**Fix:**
  * Update the condition to use the invoice partner's reference when available;
  Otherwise, fall back on the commercial partner's reference.

opw - 6330649

Forward-Port-Of: odoo/odoo#283324
Forward-Port-Of: odoo/odoo#273700

Steps to reproduce
----------------------------------------
1. Install the SMS Marketing module (mass_mailing_sms).
2. Open any SMS Marketing record in the "Sent" or "Sending" stage.
3. Click on the "Insert Field" button.

Observation
----------------------------------------
Traceback Occurs:
```
TypeError: Cannot read properties of null (reading 'getRootNode')
```

Issue
----------------------------------------
The SMS widget displays the "Insert Field" button even when the SMS message
field is readonly. The button relies on the textarea reference to open the
dynamic fields popover, but the textarea is only rendered in editable mode.

The readonly behavior of the text field can be seen here:
https://github.com/odoo/odoo/blob/ccce9fcc79edcfb1f310b49a16de8235d987b74b/addons/web/static/src/views/fields/text/text_field.xml#L5-L7

However, the SMS widget still renders the "Insert Field" button without
checking whether the message field is readonly:
https://github.com/odoo/odoo/blob/ccce9fcc79edcfb1f310b49a16de8235d987b/addons/sms/static/src/components/sms_widget/fields_sms_widget.xml#L6

As a result, clicking the button in readonly mode tries to access an
unavailable textarea reference to open the dynamic fields popover, causing
a traceback.

Solution
----------------------------------------
Hide the "Insert Field" button when the SMS message field is readonly,
preventing the dynamic fields popover from being opened when the textarea
reference is unavailable.

---
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Forward-Port-Of: odoo/odoo#283446
Forward-Port-Of: odoo/odoo#282845

Problem: 
When a `table` with a `color`/`backgroundColor` contains a nested `table`, `distributeTableColorsToAllCells` propagates the outer table's color to every `td` in the subtree, including cells belonging to the inner table. The inner table's own color is then discarded since its `td`s already have a value.

Cause: 
`table.querySelectorAll("td")` returns every `td` in the entire subtree, not just the table's own direct cells.

Solution:
Scope the selected `td`s to `td.closest("table") === table`, so a table's color is only distributed to its own cells.

Steps to reproduce:
1. Add a `background-color` to an outer `table`.
2. Nest a `table` with a different `background-color` inside one of its cells.
3. Load/normalize the content in the editor.
4. Observe both tables' cells carry the outer table's color.

opw-6438972

---
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Forward-Port-Of: odoo/odoo#283373
Forward-Port-Of: odoo/odoo#281413

Steps to reproduce:
1. Create a button
2. Choose "custom" in type
3. Put a gradient for Fill option
4. Remove border (put 0)

Problem:
Since [this commit][1] support has been added to preview custom buttons with gradient backgrounds in the website builder. However, if a user sets the border to 0px it a false border is shown. This is inconsistent the changes that will be applied to the button on the website. The cause is how the preview border is set. In the same [commit][1], borders are previewed at 2px regardless of their actual size. This works for solid background buttons but causes a gradient pseudo-border to appear with custom gradient buttons.

Solution:
The solution is to set the preview button's border-width styling to 0px in the case when the border is being changed and its width is set to 0. This styling does not affect the classes applied to the actual button being edited and is removed if the border thickness is changed again.

[1]: https://github.com/odoo/odoo/commit/291a77c50f19622f8083a5e3798c17b49f3b1c7e

task-6296905

When updating mail notifications during `mail.mail._send()`,

a `SerializationFailure` raised while flushing the notification recordset leaves the current transaction in an aborted state.

As `_send()` continues handling the exception, accessing fields:
 - https://github.com/odoo/odoo/blob/127f1316540ec6cc6880ea3515e6923ba3903bc7/addons/mail/models/mail_mail.py#L816

So, any subsequent SQL query fails with

`InFailedSqlTransaction`, masking the original concurrency error.

Avoid accesing to `mail.message_id` with aborted cursor, preserving the original `SerializationFailure`.

A regression test is added to simulate a concurrency failure during

`flush_recordset()` and verify that the cursor is no longer used dirty

The logger for the unittest without the fix is the following:

```log
During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "odoo/addons/mail/models/mail_mail.py", line 719, in _send
    notifs.flush_recordset(['notification_status', 'failure_type', 'failure_reason'])
  File "<string>", line 3, in flush_recordset
  File "unittest/mock.py", line 1139, in __call__
    return self._mock_call(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "unittest/mock.py", line 1143, in _mock_call
    return self._execute_mock_call(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "unittest/mock.py", line 1204, in _execute_mock_call
    result = effect(*args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^
  File "odoo/addons/test_mail/tests/test_message_post_concurrent.py", line 93, in mocked_mail_notification_flush_recordset
    return original_flush_recordset(self, *vals, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "odoo/odoo/models.py", line 6788, in flush_recordset
    self._flush(fnames)
  File "odoo/odoo/models.py", line 6852, in _flush
    model.browse(some_ids)._write_multi(vals_list)
  File "odoo/odoo/models.py", line 4938, in _write_multi
    self.env.execute_query(SQL(
  File "odoo/odoo/api.py", line 993, in execute_query
    self.cr.execute(query)
  File "odoo/odoo/sql_db.py", line 371, in execute
    res = self._obj.execute(query, params)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
psycopg2.errors.SerializationFailure: could not serialize access due to concurrent update

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "odoo/addons/test_mail/tests/test_message_post_concurrent.py", line 107, in test_mail_send_dirty_cursor
    mails.send()
  File "odoo/addons/mail/models/mail_mail.py", line 652, in send
    self.browse(batch_ids)._send(
  File "odoo/addons/mail/models/mail_mail.py", line 818, in _send
    mail.id, mail.message_id)
             ^^^^^^^^^^^^^^^
  File "odoo/odoo/fields.py", line 1309, in __get__
    self.compute_value(recs)
  File "odoo/odoo/fields.py", line 1491, in compute_value
    records._compute_field_value(self)
  File "odoo/odoo/models.py", line 5302, in _compute_field_value
    fields.determine(field.compute, self)
  File "odoo/odoo/fields.py", line 113, in determine
    return needle(records, *args)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "odoo/odoo/fields.py", line 710, in _compute_related
    record[self.name] = self._process_related(value[self.related_field.name], record.env)
                                              ~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "odoo/odoo/models.py", line 7083, in __getitem__
    return self._fields[key].__get__(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "odoo/odoo/fields.py", line 1272, in __get__
    recs._fetch_field(self)
  File "odoo/odoo/models.py", line 4120, in _fetch_field
    self.fetch(fnames)
  File "odoo/addons/mail/models/mail_message.py", line 756, in fetch
    return super().fetch(field_names)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "odoo/odoo/models.py", line 4158, in fetch
    fetched = self._fetch_query(query, fields_to_fetch)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "odoo/odoo/models.py", line 4245, in _fetch_query
    rows = self.env.execute_query(query.select(*sql_terms))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "odoo/odoo/api.py", line 993, in execute_query
    self.cr.execute(query)
  File "odoo/odoo/sql_db.py", line 371, in execute
    res = self._obj.execute(query, params)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
psycopg2.errors.InFailedSqlTransaction: current transaction is aborted, commands ignored until end of transaction block
```

Real error in production:

```log
2023-04-15 10:43:14,978 106451 ERROR my_db odoo.sql_db: bad query: UPDATE "mail_notification" SET "failure_reason" = "__tmp"."failure_reason"::text, "failure_type" = "__tmp"."failure_type"::VARCHAR, "notification_status" = "__tmp"."notification_status"::VARCHAR FROM (VALUES (4426629, 'Error without exception. Probably due to concurrent access update of notification records. Please see with an administrator.', 'unknown', 'exception')) AS "__tmp"("id", "failure_reason", "failure_type", "notification_status") WHERE "mail_notification"."id" = "__tmp"."id" ERROR: could not serialize access due to concurrent update
```

```log
2023-04-14 10:43:14,978 106451 ERROR my_db odoo.sql_db: bad query: UPDATE "mail_mail" SET "failure_reason"='Error without exception. Probably due do sending an email without computed recipients.',"headers"='{''X-SMTPAPI'': ''{"ip_pool": "Transactional"}'', ''X-Odoo-Objects'': ''sale.order-1436960''}',"state"='exception',"write_uid"=1,"write_date"=(now() at time zone 'UTC') WHERE id IN (2548540)
ERROR: current transaction is aborted, commands ignored until end of transaction block
```

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:


# UPDATE 2026-07-22

The reviewer requested to remove the large docstring

For record, the docstring was

```python
    """Reproduces a concurrency scenario where `mail_mail._send()` fails with a PSQL SerializationFailure after
        flushing `mail.notification` records. After such a failure, the cursor is left in an aborted
        (`InFailedSqlTransaction`) state, so any further SQL access (e.g. reading `mail.message_id` like
        https://github.com/odoo/odoo/blob/127f1316540ec6cc68/addons/mail/models/mail_mail.py#L816)
        would raise a new error masking the original SerializationFailure.

        Setup:
        - Uses a separate `cursor()` to create and commit a message with its `mail.mail` and `mail.notification`
        records, so they are visible to a second, concurrent transaction.

        Concurrency simulation:
        - `MailNotification.flush_recordset` is patched so that, right before the real flush runs, a second cursor
        updates the same `mail.notification` records (`failure_reason`). This forces PSQL to raise a
        SerializationFailure when the original transaction tries to flush those rows.

        Assertions:
        - `SerializationFailure` is raised confirming the concurrency conflict.
        - `mail_mail._send()` logs the expected error message containing the mail `id` and `message-id`

        Cleanup: created records are unlinked in `finally`
        """
```

# UPDATE 2026-07-23

The reviewer requested to remove the unittest

For record, the unittest was

```diff
diff --git a/addons/test_mail/tests/test_message_post.py b/addons/test_mail/tests/test_message_post.py
index 53dd5b9eec52..46a3958a5bff 100644
--- a/addons/test_mail/tests/test_message_post.py
+++ b/addons/test_mail/tests/test_message_post.py
@@ -7,17 +7,21 @@ from datetime import datetime, timedelta
 from freezegun import freeze_time
 from itertools import product
 from markupsafe import escape, Markup
+from psycopg2.errorcodes import SERIALIZATION_FAILURE as SERIALIZATION_FAILURE_CODE
+from psycopg2.errors import SerializationFailure
 from unittest.mock import patch
 
-from odoo import tools
+from odoo import SUPERUSER_ID, api, tools
 from odoo.addons.base.tests.test_ir_cron import CronMixinCase
-from odoo.addons.mail.tests.common import mail_new_test_user, MailCommon
+from odoo.addons.mail.models.mail_notification import MailNotification
+from odoo.addons.mail.tests.common import mail_new_test_user, MailCommon, MockEmail
 from odoo.addons.test_mail.data.test_mail_data import MAIL_TEMPLATE_PLAINTEXT
 from odoo.addons.test_mail.models.test_mail_models import MailTestSimple
 from odoo.addons.test_mail.tests.common import TestRecipients
 from odoo.api import call_kw
 from odoo.exceptions import AccessError
-from odoo.tests import tagged
+from odoo.modules.registry import Registry
+from odoo.tests import TransactionCase, get_db_name, tagged
 from odoo.tools import mute_logger, formataddr
 from odoo.tests.common import users
 
@@ -2244,3 +2248,49 @@ class TestMessagePostLang(MailCommon, TestRecipients):
                                     self.assertIn('html lang="es_ES"', email['body'])
                                 else:
                                     self.assertIn('html lang="en_US"', email['body'])
+
+
+@tagged('database_breaking')
+class TestMessagePostConcurrent(MockEmail, TransactionCase):
+    """Mail concurrency edge cases that require real, separately committed transactions
+    instead of the usual rollback-based TransactionCase isolation.
+    """
+
+    def test_mail_send_dirty_cursor(self):
+        """Reproduces SerializationFailure `mail_mail._send()` fails,
+        the cursor is left in an aborted state, so any further SQL access would raise a new error
+        (e.g. reading `mail.message_id` like
+        https://github.com/odoo/odoo/blob/127f1316540ec6cc68/addons/mail/models/mail_mail.py#L816)
+        """
+        original_flush_recordset = MailNotification.flush_recordset
+
+        def mocked_mail_notification_flush_recordset(self, *args, **kwargs):
+            with Registry(get_db_name()).cursor() as cr:
+                cr.execute('UPDATE mail_notification SET failure_reason = %s WHERE id IN %s', ('Forced Concurrent Update', tuple(self.ids)))
+            return original_flush_recordset(self, *args, **kwargs)
+
+        recs2unlink = []
+        with Registry(get_db_name()).cursor() as cr:
+            env = api.Environment(cr, SUPERUSER_ID, {})
+            partner = env.ref('base.user_admin').partner_id
+            try:
+                message = partner.message_post(body='Hello', message_type='comment', partner_ids=[partner.id], mail_auto_delete=False, force_send=False)
+                notifs = env['mail.notification'].search([('notification_type', '=', 'email'), ('mail_mail_id', 'in', message.mail_ids.ids)])
+                self.assertTrue(notifs)
+                mails = message.mail_ids
+                recs2unlink.extend([notifs, mails, message])
+                cr.commit()
+
+                mails = self.env[mails._name].browse(mails.ids)
+                with (
+                    mute_logger('odoo.sql_db'), self.assertRaises(SerializationFailure) as exc, self.mock_mail_gateway(),
+                    patch(f'{MailNotification.__module__}.{MailNotification.__name__}.flush_recordset', autospec=True, side_effect=mocked_mail_notification_flush_recordset),
+                    self.assertLogs('odoo.addons.mail.models.mail_mail', level='ERROR') as log_capture,
+                ):
+                    mails.send()
+            finally:
+                for rec2unlink in recs2unlink:
+                    env[rec2unlink._name].browse(rec2unlink.ids).unlink()
+
+            self.assertEqual(exc.exception.pgcode, SERIALIZATION_FAILURE_CODE)
+            self.assertIn(f'Exception while processing mail with ID {mails.id} and Msg-Id \'{mails.message_id}\'.', [record.message for record in log_capture.records])

```

---
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Forward-Port-Of: odoo/odoo#279897
Forward-Port-Of: odoo/odoo#274089

[FIX] l10n_ch: fix default contract type

This task is runbot error fix that occured from 19.0 to 19.2

Bug reproduction:

1 - Go to version 19.0, install l10n_ch_hr_payroll_account 2 - Execute test_version_timeline_auto_save_tour tour test 3 - It fails in .o_arrow_button_wrapper[data-tooltip^='Contract:'] step

Bug cause:

1 - When l10n_ch_hr_payroll_account is installed:

    1.1 - contract type becomes "Permanent contract with monthly salary"
    1.2 - the employee is not swiss but it has this CH contract type

2 - data-tooltip starts with Permanent contract instead of contract

    2.1 - Tour fails

3 - contract_type_id is overwritten in swiss modules

    3.1 - Default is assigned without looking to the country of self.env

Bug solution:

1 - If the country is not swiss, the default is assigned as False

    1.1 -> fixed in l10n_ch_hr_payroll/hr_version

    1.2 instead of assigning swiss contract type to the non-swiss emp.

Note: This is fix from saas-18.4 to master.

task-6392040

runbot error: https://runbot.odoo.com/odoo/runbot.build.error/941358

Forward-Port-Of: odoo/enterprise#127687
Forward-Port-Of: odoo/enterprise#126520

Following the fix made in community branch, this adds a test veryfing the expected behavior in case of a fluctuating rate for the domestic currency.

Scenario 2: fluctuating domestic (USD) rate
 USD rate=1 from Jan 1 to Jun 30, USD rate=3 from Jul 1 to Dec 31
 EUR rates unchanged: 2 from Jan 1, 4 from Jul 1

 Correct conversion factors (= USD_rate / EUR_rate):
  Jan 1 – Jun 30 (182 days): 1/2 = 0.50
  Jul 1 – Dec 31 (184 days): 3/4 = 0.75

 Current rate at 2020-12-31:      3/4 = 0.75
 Correct average rate:            (0.50 * 182 + 0.75 * 184) / 366 = 229/366 ≈ 0.62568
 Previsouly bugged average rate (USD fixed at current=3): (1.50 * 182 + 0.75 * 184) / 366 = 411/366 ≈ 1.12295

 Historical equity rates (correct vs previously bugged):
  Mar 1 (USD=1, EUR=2): correct = 1/2 = 0.50; buggy = 3/2 = 1.50  → 40 * 0.50 = 20 vs 40 * 1.50 = 60
  Oct 1 (USD=3, EUR=4): correct = 3/4 = 0.75; buggy = 3/4 = 0.75  → 60 * 0.75 = 45 (same by coincidence)

task-5953104

X-original-commit: 6357edc49f8bbc0d553dc6073c66865bf5af9db1

Following the fix made in community branch, this adds a test veryfing the expected behavior in case of a fluctuating rate for the domestic currency.

Scenario 2: fluctuating domestic (USD) rate
 USD rate=1 from Jan 1 to Jun 30, USD rate=3 from Jul 1 to Dec 31
 EUR rates unchanged: 2 from Jan 1, 4 from Jul 1

 Correct conversion factors (= USD_rate / EUR_rate):
  Jan 1 – Jun 30 (182 days): 1/2 = 0.50
  Jul 1 – Dec 31 (184 days): 3/4 = 0.75

 Current rate at 2020-12-31:      3/4 = 0.75
 Correct average rate:            (0.50 * 182 + 0.75 * 184) / 366 = 229/366 ≈ 0.62568
 Previsouly bugged average rate (USD fixed at current=3): (1.50 * 182 + 0.75 * 184) / 366 = 411/366 ≈ 1.12295

 Historical equity rates (correct vs previously bugged):
  Mar 1 (USD=1, EUR=2): correct = 1/2 = 0.50; buggy = 3/2 = 1.50  → 40 * 0.50 = 20 vs 40 * 1.50 = 60
  Oct 1 (USD=3, EUR=4): correct = 3/4 = 0.75; buggy = 3/4 = 0.75  → 60 * 0.75 = 45 (same by coincidence)

task-5953104

Forward-Port-Of: odoo/enterprise#123055