Steps to reproduce:
1. Install eCommerce and Subscriptions.
2. Create a 21% Excluded tax.
3. Create a subscription product with a price of 45 with 21% tax and enable "Accept One-Time" in the Recurring Prices tab.
4. Publish the product on the website under the Sales tab.
5. Create a pricelist for 6 months recurring with two lines:
 - If min quantity is 0, then 0% discount
 - If min quantity is 2, then 5% discount
6. Set "Display Product Prices" to "Tax Included" in the Settings.
7. Open the product on the website, select the 6-month plan, and increase quantity to 2.

Issue:
The discount percentage displayed on the website shows 4% instead of the configured 5%.

Why this happens:
In `_get_additionnal_combination_info`, the discount is reverse-calculated from the tax-included price vs the tax-included sales price. When the 21% tax is included to both prices, it introduces a floating-point precision loss (4.9954..%), which floor() then truncates to 4%.

Fix:
When the pricelist rule uses 'percentage' discount, read `percent_price` directly from the pricing rule instead of reverse-calculating from tax-adjusted prices, as it represents the exact discount percentage the merchant configured with no floating-point involvement.

opw-6224735

Forward-Port-Of: odoo/enterprise#121654

`sync_participants` calls `action_set_unlink` on every participant whose record is no longer in the campaign domain, and `action_set_unlink` writes "Record deleted" on each scheduled trace. The removed bucket also contains records that still exist but no longer match the campaign filter, so the cancelled trace dialog shows "Record deleted" even when the record was only filtered out.

In `sync_participants`, the to_remove participants are split between those whose record still exists in the database (filtered out by the campaign domain) and those whose record was actually deleted. `action_set_unlink` accepts an optional `trace_message` argument, defaulting to "Record deleted", and the filtered-out batch passes "Record no longer matches campaign filter" so the cancelled trace dialog reflects the real cause.

Steps to reproduce:
1. Install Marketing Automation and CRM.
2. Open Marketing Automation, create a campaign on Lead with filter Stage = New.
3. Add a begin activity to the workflow.
4. Open CRM, create a Lead in the New stage.
5. Back in the campaign, click Generate Participants.
6. In the CRM pipeline, drag the Lead from New to Qualified.
7. Back in the campaign, click Generate Participants again.
8. Open the Participants smart button, click the participant for the moved Lead.
9. Click the cancelled activity in the workflow timeline.

=> The activity dialog shows "Error message: Record deleted" although the Lead still exists.

Ticket [link](https://www.odoo.com/odoo/project/49/tasks/6251264)
opw-6251264

Forward-Port-Of: odoo/enterprise#118692

Issue before this commit:
=========================
When splitting a done picking that contains at least one stock move whose
done quantity is less than the demanded quantity (product_uom_qty),
an expected singleton traceback occurs.

Steps to Reproduce:
=========================
- Install the stock module with demo data.
- Create a delivery picking for any product with a demand of 5.
- Set the done quantity to 2.
- Validate the picking without creating a backorder.
- Try to split the validated/done picking.
- An expected singleton traceback is raised.

Cause of the issue:
=========================
Previously, attempting to split a done picking simply returned because 
there was nothing left to split.

After this [PR](https://github.com/odoo/odoo/pull/224952), the split action calls **message_post()** to post a note on the original picking 
of the generated backorder. However, no backorder is created when splitting a done picking
since there is no remaining quantity to split. As a result, message_post() is called on 
an empty recordset, leading to an expected singleton traceback.

With This Commit:
=========================
Splitting a done picking has no functional purpose, as there is nothing left to split.
In this case, simply return without performing any action. This preserves the 
previous behaviour and prevents the traceback.

Forward-Port-Of: odoo/odoo#274382

The avatar card tour asserts the systray activity counter, which only counts activities whose state is today or overdue. The test scheduled its activities without an explicit deadline, so activity_schedule fell back to context_today on the class environment, whose superuser has tz Europe/Brussels with demo data. When the test runs between 22:00 and 00:00 UTC, that deadline is tomorrow from a UTC point of view. The state of an activity is however computed in the timezone of its assigned user, and hr_user is created without one, falling back to the server date (UTC). Its activities were therefore planned instead of today, the counter stayed empty and the tour timed out. The admin iteration kept passing because demo data gives admin the same Brussels timezone as the environment that computed the deadline, which is why only half the runs failed (both occurrences at 23:56 and 23:31 UTC).

Schedule the activities with a deadline one week in the past instead: an old deadline is overdue in every timezone, whatever timezone the scheduling environment or the assigned user has, making the counter deterministic at any time of the day.

https://runbot.odoo.com/odoo/error/941407

Forward-Port-Of: odoo/odoo#274679

Steps to reproduce:
1. Create a log note or send a message on any record and open the full composer.
2. Set a date in the future to schedule the message for later and click schedule.
3. Click on the "Edit" button of the newly scheduled message.
4. Try dragging and dropping an image into the body, or add a file as an attachment using the button.

Issue:
- Dragging and dropping an image into the form does nothing.
- Trying to add a file as an attachment using the button triggers a traceback: `TypeError: Cannot read properties of undefined (reading 'resId')`

Why this happens:
- The failure when adding explicit file attachments occurs because the `model` and `res_id` fields were omitted from the `mail.scheduled.message` form view layout in the commit 3b985d2. Without these field  declarations, the `mail_composer_attachment_selector` widget cannot determine the record metadata parameters, causing the upload to crash.
- The failure of the drag-and-drop mechanism occurs because the scheduled message edit view uses the default `FormController` class instead of `MailComposerFormController` which is used in the `mail_compose_message` view. Consequently, the underlying `useCustomDropzone` is never instantiated on the view, leaving drop events unhandled.

Fix:
1. Specify `js_class="mail_composer_form"` to the scheduled message form view definition tag to handle drag and drop, as well as adding the missing fields
2. Assign the `resIds` variable based on the message type since it is defined as `res_id` instead of `res_ids` in `mail.scheduled.message`.

opw-6273260

Forward-Port-Of: odoo/odoo#268515

# How to reproduce
- Install the Website module
- Install another module that has atleast one model with one html field,
sanitize=Flase or sanitize_form=False and groups
- Remove the field's group from the current user
- Enable dev mode
- Go to Settings > Technical > Database Structure > Models
- Pick any model (e.g. sale.order.line)
- Add a field to that model & Save
- Delete the added field & Save

> Note : Significantly harder to reproduce since :
https://github.com/odoo/odoo/commit/9a336bbb94b0a4266d84f7554c024c3abd2d1e7c
I am not sure a field as mentionned in the steps exists

# The problem
An access error is raised for the module wich access rights were
removed, even if the module is not linked in any way with the picked
model

# Cause of the issue
Deleting the field will endup calling the `unlink()` method of
`BaseModel` on the `ir.model.fields` record. This function triggers all
`@api.delete` methods defined on the model :
https://github.com/odoo/odoo/blob/5538132d9d14c4cc5031fc50ac0388ad2ab0fc92/odoo/models.py#L4548-L4552

This will call the this method :
https://github.com/odoo/odoo/blob/5538132d9d14c4cc5031fc50ac0388ad2ab0fc92/addons/website/models/website_form.py#L153-L154

That was introduced by :
https://github.com/odoo/odoo/commit/c0a827519844ec43537e4487f6abe358bb82ba9a

Which prevents a field from being deleted if it is actively used in any
website form. But this method does a search on every model return by
`_get_html_fields` which may contains models that are not accessible by
the user, so we get an access error.

# Proposed solution
Since `_check_if_used_in_website_form` should perform the same
independently from the user, we can do the search in sudo

opw-6231951

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Forward-Port-Of: odoo/odoo#274332
Forward-Port-Of: odoo/odoo#265781