[FIX] point_of_sale: better quantity change handling
Before this commit, when changing the quantities of a line, we would not automatically change the quantities of the children lines if any. This is now the case. We also handle the prices in a better way such that changing the quantities of a combo product does not affect the price unit of the lines computed previously.
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Forward-Port-Of: odoo/odoo#237277
This PR targets saas-18.4 and is part of the forward-port chain. Further PRs will be created up to master.
More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port
@adgu-odoo this forward port of odoo/odoo#237277 is awaiting action (not merged or closed).
@adgu-odoo this forward port of odoo/odoo#237277 is awaiting action (not merged or closed).
