Steps to reproduce:
1. Install Knowledge.
2. Create an article.
3. Open the more actions menu.
4. Click "Add Cover".
5. Upload a cover image.

Issue:
- The upload crashes with the following traceback:
`Uncaught Promise > this.props.setAbortUploadsCallback is not a function`

Cause:
- `KnowledgeCoverSelector` extends the html_editor `ImageSelector`, whose upload flow registers an abort callback through setAbortUploadsCallback. The generic MediaDialog provides this callback, but KnowledgeCoverDialog renders KnowledgeCoverSelector directly and did not pass it. As a result, the inherited upload flow called a missing prop.

Solution:
- Pass setAbortUploadsCallback from KnowledgeCoverDialog to KnowledgeCoverSelector and abort pending uploads when the cover dialog is discarded.

Alternative approach: 
- Make ImageSelector tolerate callers that do not provide
  setAbortUploadsCallback by calling it with optional chaining.

opw-6176716

Forward-Port-Of: odoo/enterprise#120467
Forward-Port-Of: odoo/enterprise#116906

Steps to reproduce:
1. Open the Project application and open any project.
2. Filter the tasks by milestone (milestone deadlines appear as expected in the kanban view).
3. Open any task form view.
4. Click the browser's back button (or simply refresh the page while on the task kanban view).

Issue:
Milestone deadline dates disappear from the task Kanban cards and headers after navigating back or reloading.

Why this happens:
When hitting the browser back button or refreshing, the web client's router state recovery workflow executes (`loadRouterState` -> `loadState` -> `doAction` -> `_executeActWindowAction`). During this flow, `_getActionParams` checks if it can reuse the cached `lastAction`. However, due to a safety condition introduced in commit ab26f95893 to prevent embedded action showing across different projects, the router falls back to generating a fresh action request via `state.action`.

This forces `_loadAction` to fetch the action definition from the database. Because the original base action window `act_project_project_2_project_task_all` lacks the `display_milestone_deadline` key inside its default context dictionary, the reloaded view is rendered without the flags required by the frontend to display milestone deadlines.

opw-6283514

Forward-Port-Of: odoo/odoo#269781

## Issue
In the *Data Recycle* app, when grouping records, the record IDs are summed up and appear right next to the name of each group, which:

1. truncates the name and count of the groups
2. does not make sense (summing up IDs is pointless)

<img width="720" height="281" alt="115492" src="https://github.com/user-attachments/assets/567902af-b356-4a0a-8b1e-2ed101a2eba3" />

## Steps to reproduce
1. Install *Data Recycle* (`data_recycle`)
2. In Data Cleaning > Configuration > Recycle Records, create a new rule:
    - Any name
    - Model: *Contact*
    - Filter: *Name contains G* (or anything else that matches some records)
4. Click the *Run Now* button in the upper left corner
5. In Data Cleaning > Recyle Records, group the records by any field (e.g., *Model*)
6. **The name of the group (Contact) is truncated, making it and the record count unreadable. This is due to the sum of Record ID being displayed in the same row, even though that information is irrelevant.**

## Cause
Similarly to related enterprise PR https://github.com/odoo/enterprise/pull/115492, the *Record ID* field of the `data_recycle.record` model uses the default `sum` aggregator.

https://github.com/odoo/odoo/blob/6de867f1c92bacedc0574b63e9e6a2a57fe805dd/addons/data_recycle/models/data_recycle_record.py#L17

related: https://github.com/odoo/enterprise/pull/115492

opw-6219824

Forward-Port-Of: odoo/odoo#265163

## Issue
In the *Data Cleaning* app, when grouping records, the record IDs are summed up and appear right next to the name of each group, which:
1. truncates the name and count of the groups
2. does not make sense (summing up IDs is pointless)

<img width="709" height="374" alt="6166623-before" src="https://github.com/user-attachments/assets/9d80b1ec-49c0-4b7f-8c6e-53846f9e433e" />

## Steps to reproduce
1. Install *Data Cleaning* (`data_cleaning`)
2. In Data Cleaning > Configuration > Field Cleaning, create a new rule (or edit an existing one):
    - Any name
    - Model: *Contact*
    - Rule:
        - Field to Clean: *Name (Contact)*
        - Action: *Set Type Case* - Case: *All Uppercase*
4. Click the *Clean* button in the upper left corner
5. In Data Cleaning > Field Cleaning, group the records by any field (e.g., *Field*)
6. **The name of the group (_Name (Contact)_) is truncated, making it and the record count unreadable. This is due to the sum of _Record ID_ being displayed in the same row, even though that information is irrelevant.**

## Cause
The *Record ID* (`res_id`) field is an Integer field defined [here](https://github.com/odoo/enterprise/blob/3603afdd5c0d19c9276f3855156be4040ab5717d/data_cleaning/models/data_cleaning_record.py#L20). By default, Integer fields have the `sum` aggregator:

https://github.com/odoo/odoo/blob/681610c002a310f1c73fc2e5bec8d3dae27bc4a7/odoo/orm/fields_numeric.py#L17-L23

This causes the IDs to be summed up and appear in the group headers.

## After

<img width="740" height="370" alt="6166623-after" src="https://github.com/user-attachments/assets/a42d8f58-06dc-4308-8b6f-1ab09e8034f8" />

related: https://github.com/odoo/odoo/pull/265163

opw-6166623

Forward-Port-Of: odoo/enterprise#115492

# How to reproduce
- Create an Event registration
- Add a follower
- Click on the enveloppe icon next to the sender's name in the chatter

# The problem
A traceback appears

# Cause of the issue
When clicking on the enveloppe, we display the `message_notification_popover` that calls `isFollowerNotification` to filter follower notifications from other ones. This function compares the ids of the followers of the notification to it's res_partner_id : https://github.com/odoo/odoo/blob/ee12a62407fa1c2dbca00d77dc6d5bd16eac1e43/addons/mail/static/src/core/common/notification_model.js#L101-L105

But in our case res_partner_id is undefined because it is not a required field and it will not be set in the case of mass_mailing :
https://github.com/odoo/odoo/blob/ee12a62407fa1c2dbca00d77dc6d5bd16eac1e43/addons/mail/models/mail_notification.py#L23-L27

opw-6178443

---
I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

Forward-Port-Of: odoo/odoo#265263

Version:
- 19.0

Steps to reproduce:
- Create a sign template with a readonly sign item linked to an auto field.
- Use a reference record where the linked field value is empty or False.
- Send the document for signing.
- Complete the signing flow.

Issue:
- Readonly sign items linked to auto-filled values could not properly handle
  falsy values. Empty values could trigger the error "Some required items are
  not filled" and completed sign requests displayed the sign item placeholder
  instead of the actual auto-filled value.
- completed document generation could fail when rendering falsy values for
  textarea sign items.

Cause:
- Falsy auto-filled values were ignored during constant item population and
  replaced by the sign item placeholder. Additionally, readonly constant items
  were included in required field validation and completed sign requests
  continued to display placeholders when the stored value was empty.
- document rendering assumed sign item values were always strings for textarea
  sign items but when auto field is empty it value can be False.

Fix:
- Preserve falsy values when populating readonly constant items, exclude
  constant items from signer validation, and hide placeholders for empty
  auto-filled constant items when displaying completed sign requests.
- Normalize falsy values to prevent crashes and allow completed documents
  to be generated correctly.

Forward-Port-Of: odoo/enterprise#121009

**Steps to reproduce:**

- Enable "Track orders edits" in the settings
- Enable "Log in with Employees"
- Go to the Restaurant, log in with employee A
- Go to a table, order 3 Sushis
- Go back to the floor plan and change to employee B
- Go back to the table and change the qty of 3 Sushis to 2 Sushis
- Go to the order in the backend and check the chatter
- It will indicate that employee A did the change, but it was employee B

**Why the fix:**

We always used the cashier set on the order to determine who should be put in the chatter, regardless of who is actually connected at that point.

We now use the session's current employee to write who did the change in the chatter.

We do not change the order's employee, because it will be done once the order has been paid.

In the case where we are not logged in but pos_hr is installed, the employee_id might be the id of a res.user, and
browsing it might return the wrong value. To avoid this, we check if the value exists as a hr.employee before assigning the name.

The way we return the value has been changed because the linter wasn't happy about it.

opw-6213504

Forward-Port-Of: odoo/odoo#270416
Forward-Port-Of: odoo/odoo#265582

a4efb745e9f4ba24dfa01f1e17e65f1a7cac90a5 merged the web_studio dynamic field and
the mass_mailing dynamic field into a single field selector,
included from the HTML editor.

This introduces a new flow where the user has to first "activate"
the field selector popover ( /field ), which appears as an overlay item;
then open the ModelFieldSelector dropdown to select a field on its
model, which appears as another overlay item.

As both overlay items overlap, and they have the same "z-index"
property, the last sibling in the overlay container appears first.

In mass_mailing, the ModelFieldSelector selector dropdown's overlay
item is introduced as the first child of that container; this results
in the dropdown appearing behind the item through which it was opened.

Fix: Overlay items holding a Dynamic Field Popover have their z-index
property reduced by 1, ensuring they appear behind their
ModelFieldSelectors at all times.

Steps to reproduce:
- Create a new mailing
- Add in any text node
- Type in /field
- Press Enter
- Click the [-] to select a field

task-5477951

This commit ensures product images follow their visual order in the
product image viewer when using the grid layout.

Steps to reproduce:
- Open a product page with multiple images (or add Extra Media to the 
  product)
- Change layout mode to "Grid" and click save
- Click any image to open the product image viewer
- Navigate between images

Images do not follow the visual left-to-right order. This regression was
introduced by [commit], which replaced the row-based grid with a
column-first layout. As a result, `querySelectorAll` returns images in
DOM order, which no longer matches the visual order.

To fix this, images are now reordered based on their visual placement in
the grid so navigation matches the order seen by the user. Images are
traversed in visual left-to-right order while also accounting for
varying image heights and multi-column alignment.

[commit]: https://github.com/odoo/odoo/commit/9a3628b9735550bf8ecc2252ea1b7338f68ab966
task-[4364143](https://www.odoo.com/odoo/project/974/tasks/4364143)

Forward-Port-Of: odoo/odoo#270732
Forward-Port-Of: odoo/odoo#254077

Steps to reproduce:
- Create a US company
- Go to Accounting > Configuration > Settings
- Activate `Avatax` > Set Credentials
- Try to "Sync Parameters"

Traceback:
```py
  File "/home/odoo/src/enterprise/saas-19.2/account_avatax/models/res_company.py", line 113, in avatax_sync_company_params
    'valid_country_ids': [(6, 0, get_countries(vals['validCountries']).ids)],
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/enterprise/saas-19.2/account_avatax/models/res_company.py", line 90, in get_countries
    return self.env['res.country'].browse([country_cache[code] for code in code_list])
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/saas-19.2/odoo/orm/models.py", line 5208, in browse
    assert all(ids) or all(isinstance(x, NewId) or x for x in ids), "Invalid falsy real id"
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: Invalid falsy real id
```

The issue occurs because AvaTax return `*` in the `validCountries` field to indicate that an exemption code is valid for all countries. The synchronization logic stores this value in the country cache as `False` and later passes it to `res.country.browse()`. Since `browse()` does not accept a mix of valid IDs and falsy values, the operation crashes during the synchronization process.

This commit filter out falsy country IDs when resolving country codes to prevent crashes and allow exemption codes to be synchronized successfully.

opw-6298189

Forward-Port-Of: odoo/enterprise#120845

## Description

When loading demo data from **Settings** after installing `l10n_in` without demo data, the `_install_demo` method receives company IDs instead of a `res.company` recordset.

As a result, the following line crashes:

```python
companies.filtered(...)
```

with:

```text
AttributeError: 'int' object has no attribute 'filtered'
```

This PR ensures that the received company IDs are converted into a `res.company` recordset before being processed, allowing demo data to be loaded successfully from the Settings menu.

## Steps to Reproduce

1. Install `l10n_in` **without demo data**.
2. Navigate to **Settings**.
3. Click **Load Demo Data**.

## Current Behavior

Demo data installation fails with:

```text
AttributeError: 'int' object has no attribute 'filtered'
```

## Expected Behavior

Demo data should be installed successfully without raising any exception.

## Solution

Convert the received company IDs into a `res.company` recordset when the argument passed to `_install_demo` is not already a recordset.

Forward-Port-Of: odoo/odoo#270523

Steps to reproduce:
===================
1. Edit a job page.
2. Delete every `s_rating` block.
3. Save.

=> Validation Error: Document is empty.

Cause:
======
Deleting the last snippet inside an editable HTML field (e.g. the last `s_rating` block in the `website_rating` field of a job page) leaves the field's editable container with only whitespace text nodes. On save, it writes that whitespace to the record and then calls `_copy_custom_snippet_translations`, which does
`html.fromstring(lang_value)` on the whitespace and raises `lxml.etree.ParserError: Document is empty`, re-raised as `ValidationError`. The user sees a "Validation Error" dialog and can't finish saving.

The previous fix for the analogous "Document is empty" symptom on product description editing (commit [1])
added a `cleanupEmptyStructures` `on_removed_handlers` that strips whitespace from `.oe_empty` containers after element removal. That selector covers `oe_structure.oe_empty` containers but not editable HTML field savables (`[data-oe-type="html"]`), which don't carry an `oe_empty` class when they originally had content. As a result, fields like `hr.job.website_rating` still hit the failing parse path.

Solution:
=========
Extend the cleanup selector to also include `[data-oe-type="html"]` so HTML-field editables are normalized to genuinely empty after the last inner snippet is removed.

[1]: https://github.com/odoo/odoo/commit/53d5cc7eed635f64038bf0315f6863011879c529

opw-6244892

---
I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

Forward-Port-Of: odoo/odoo#270466
Forward-Port-Of: odoo/odoo#267397

*: hr_holidays,test_discuss_full

**Steps to reproduce,**
Create an employee linked to a user
Archive the employee and remove the link to the user
Create another employee for the same user
Go to Discuss > 'General' channel
Open the member list and click on the user's avatar

**Before this commit,**
Clicking on the avatar opened a popover showing outdated information from the
archived employee record instead of the new one.

**Cause,**
By default, the server sends employee data ordered by name. Since both records
have the same name, the order is non-deterministic. The client then attempts to
match the employee's company to the current user's company, falling back to the
first record in the list if no match is found.

**Fix,**
Filter out archived records first (treating them as non-existent). Then, sort
the remaining employee records to prioritize those that match the current user's
active company. In case records share the same company, prioritize employees
with a related user. Fall back to descending order of creation for identical
results.

**After this commit,**
Clicking on the avatar shows the correct employee details in the popover.

task-6175765

---
I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

Forward-Port-Of: odoo/odoo#270169
Forward-Port-Of: odoo/odoo#252170