## Context
In the barcode app (`stock_barcode`), users can update inventory counts
by scanning a product's barcode or by manually entering the barcode.

## Issue
When the barcode is entered manually, the lot/serial number is created with
the *Company* field set to the current company. This causes issues when
working with intercompany flows, because lots with a company assigned
cannot be used by other companies. This behavior is also inconsistent
with the other ways of updating a company's inventory. In fact, the following
flows create serial/lot numbers with no company assigned:
- Inventory / Products / Products / *Forecasted Report* or *On Hand*
- Inventory / Operations / Adjustments / Physical Inventory
- Barcode / Inventory Count / Add product (add the serial number from
the *Inventory Count* screen, **not** by clicking on the cogwheel in
the top-right corner)

## Cause
The line assigning a `company_id` was added by https://github.com/odoo/enterprise/commit/c0151bce3c60c69e7cadeb719a81c4a702b71c34.
At the time, that behavior was consistent with the backend behavior,
as the `company_id` of a lot/serial number would always be set to `self.env.company`.
In fact, the feature allowing a lot/serial to be shared among multiple
companies was introduced later, in saas-17.2 (https://github.com/odoo/odoo/commit/99b39b72c7e65e85af6f06dcb6b02867623f3f69).
This last commit adds a compute method for the `stock.lot.company_id` field:

https://github.com/odoo/odoo/blob/6026866900fd0ac1bf6495ae249cd08f56c85342/addons/stock/models/stock_lot.py#L130-L136

Since then, lot/serial numbers shouldn't be created with a `company_id`,
as this restrict other companies to use those numbers. Users can always
add a company to a lot/serial number later if necessary.

## Solution
The line assigning a `company_id` to the `stock.lot` can be removed,
as it does not reflect the current behavior (saas-17.2+).
Nowadays, a `company_id` should be set **only** if the user wants a
lot/serial number to be used by a specific company; it should not be
the default behavior.

## Steps to reproduce
1. Install *Barcode* (`stock_barcode`).
2. In Inventory / Configuration / Settings, enable *Lots & Serial Numbers*.
3. In Settings / Users & Companies / Companies, create a second company.
Use either company for the following steps.
4. Create a product tracked *By Unique Serial Number*.
5. Open the Barcode app, then click *Inventory Count*.
6. Scan your product (or add it manually, but **do not** set the *Serial/Lot Number*).
7. Scan "SN001" (or add it manually through the cogwheel menu), then click *Apply*.
8. Go to Inventory / Products / Lots / Serial Numbers.
9. The serial number created from the Barcode app is assigned to the current company.

opw-5264216

Forward-Port-Of: odoo/enterprise#102130

Currently, the behavior of the "Maximum closing difference" feature with employees depends on the user connected in the backend and not the employee using the pos.

Steps to reproduce:
-------------------
* Set max closing difference as 0
* Have 1 admin user and 1 pos user
* Have 2 employees
* Set admin user and employee 1 as advanced employees of the pos
* Set pos user and employee 2 as basic employees

Steps with admin:
* Make sure you are logged as the admin in the database
* Open pos (could be a session opened by other user)
* Log in with Admin user
* Try to close the pos with a difference of 10 -> You can, ok
* Log in with employee 1 (advanced)
* Try to close the pos with a difference of 10 -> You ca but shouldn't

Steps with pos user
* Now log in the database as pos user
* Open pos (could be a session opened by other user
* Log in with employee 1 (advanced)
* Try to close the pos with a difference of 10 -> You cannot, ok
* Log in with Admin user
* Try to close the pos with a difference of 10 -> you cannot but should

Why the fix:
------------
Employees that have no linked user should not ba able to override the max difference.

Employees who have a connected user should only be able to override the max difference if their user is admin of the pos.

opw-5184041

Forward-Port-Of: odoo/odoo#239770
Forward-Port-Of: odoo/odoo#235356

**Steps to reproduce:**
- enable "packages" and "batch transfers" settings
- open wharehouse management/operation type
- select internal transfer
- check "automatic batch" and group by "contact"
- create two storable product with an on hand quantity of 10
- create a an internal transfer for the first product for a qty of 10
- mark it as to do
- do the same for the second product and make sure that it's the same 
contact
- open barcode and select batches
- select the last batch created
- scan WH-STOCK
- enter and confirm a quantity of 4 for each line
- click on put in pack
(at this step we can already see that the two new lines created are 
associated wit the second picking, even though it should be one line 
per picking)
- click on the +6 on each line and click on put in pack
- validate

**Current behavior:**
- a back order has been created for the first picking
- the first internal transfer has only delivered 4 units of the first 
product
- the second internal transfer has delivered 10 of the second product 
and 5 of the first product

**Expected behavior:**
both pickings should have delivered 10 of their product

**Cause of the issue:**
The lines created when clicking on "put in pack" for the first time
are both associated with the second picking because the line split:
https://github.com/odoo/enterprise/blob/898e3e47cfe3b86230da2b146960983d7ad144d0/stock_barcode/static/src/models/barcode_picking_model.js#L514
and the picking_id of the new line is set to the values provided by the
`_getNewLineDefaultValues` as the picking_id of the last selected `line`:
https://github.com/odoo/enterprise/blob/24b4e49dbe16cb8bd40170abfc089dd64c3f34dd/stock_barcode_picking_batch/static/src/models/barcode_picking_batch_model.js#L280-L281
rather than from the values of the initial line it is split from.

opw-4952964

Forward-Port-Of: odoo/enterprise#102508
Forward-Port-Of: odoo/enterprise#91378