In some conditions, a x2many field can be considered
as modified by the webclient when in fact there is
no change in 'meaningful' stored fields.
In this case, on save, an empty list of magic commands
will be sent to the server, potentially triggering
unexpected recomputations.
Steps to reproduce:
* install sale_stock & sale_management
* create a new storable product
* create a new SO
* create a new line with this product
* Confirm the SO
* Set or Update the SO delivery date (Other info tab)
* Save
-> In the chatter, you will notice an useless tracking
value being printed for the SO Total, with identical values
before and after update.
Cause
Since the server received an empty list of commands for
the `order_line` field, this triggered a recomputation
of the total amounts of the SO, even though there were no
effective changes in the lines.
Solution
Do not send empty command lists for x2m fields.
This will avoid unexpected recomputation and also improve
performance since the fields were recomputed for 'nothing'
closesodoo/odoo#155549
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>
Co-authored-by: Aaron Bohy <aab@odoo.com>
