[FIX] point_of_sale: retrieve unit price from sale order line

Unit price is recomputed on non groupable order line instead
of being the same as its sale order line counterpart.

Steps to reproduce:

- make sure unit measure category are not groupable
- create a sale order and add a line with a product with UOM
unit (ex: acoustic bloc screens) and quantity 3
- change the default unit price (100$ instead of 295$)
- open the point of sale
- open the SO and click on settle the order
=> price is 295$ instead of 100$ on each of the 3 lines

opw-3569481

closes odoo/odoo#147487

X-original-commit: 00d8a876c501098da1e8b2f7484e5e3808b61865
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>
Signed-off-by: Nicolas Danhier (nda) <nda@odoo.com>

addons/pos_sale/static/src/app/order_management_screen/sale_order_management_screen/sale_order_management_screen.js

@@ -259,7 +259,7 @@ export class SaleOrderManagementScreen extends ControlButtonsMixin(Component) {
                         let remaining_quantity = new_line.quantity;
                         while (!floatIsZero(remaining_quantity, 6)) {
                             const splitted_line = new Orderline({ env: this.env }, line_values);
-                            splitted_line.set_quantity(Math.min(remaining_quantity, 1.0));
+                            splitted_line.set_quantity(Math.min(remaining_quantity, 1.0), true);
                             this.pos.get_order().add_orderline(splitted_line);
                             remaining_quantity -= splitted_line.quantity;
                         }

addons/pos_sale/static/tests/tours/PosSaleTour.js

@@ -146,7 +146,7 @@ registry
             ProductScreen.confirmOpeningPopup(),
             ProductScreen.clickQuotationButton(),
             ProductScreen.selectFirstOrder(),
-            ProductScreen.totalAmountIs(40.25),
+            ProductScreen.totalAmountIs(32.2), // 3.5 * 8 * 1.15
             ProductScreen.selectedOrderlineHas("Product A", "0.50"),
             ProductScreen.checkOrderlinesNumber(4),
         ].flat(),

addons/pos_sale/tests/test_pos_sale_flow.py

@@ -319,16 +319,17 @@ class TestPoSSale(TestPointOfSaleHttpCommon):
             'uom_po_id': uom.id,
         })
         #create a sale order with product_a
-        self.env['sale.order'].create({
+        sale_order = self.env['sale.order'].create({
             'partner_id': self.env.ref('base.res_partner_2').id,
             'order_line': [(0, 0, {
                 'product_id': product_a.id,
                 'name': product_a.name,
                 'product_uom_qty': 3.5,
                 'product_uom': product_a.uom_id.id,
-                'price_unit': product_a.lst_price,
+                'price_unit': 8,  # manually set a different price than the lst_price
             })],
         })
+        self.assertEqual(sale_order.amount_total, 32.2)  # 3.5 * 8 * 1.15
         self.main_pos_config.open_ui()
         self.start_tour("/pos/ui?config_id=%d" % self.main_pos_config.id, 'PosSettleOrderNotGroupable', login="accountman")