delivery_usability: Move code from stock_packaging_usability_pp to delivery_usability

I don't use stock_packaging_usability_pp from OCA/stock-logistics-tracking because the feature is native since v11 (I didn't figure it out when I ported stock_packaging_usability_ul from v10 to v14 under the new name stock_packaging_usability_ul
I also improved the code to clean it up and use the native field for measured weight

delivery_usability/models/stock_quant_package.py

@@ -0,0 +1,68 @@
+# Copyright 2019-2024 Akretion France (https://www.akretion.com)
+# @author Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+
+from odoo import fields, models
+from odoo.tools import float_is_zero
+
+
+class StockQuantPackage(models.Model):
+    _inherit = "stock.quant.package"
+
+    # These 2 fields are defined in the 'delivery' module but they forgot
+    # the decimal precision
+    shipping_weight = fields.Float(digits="Stock Weight")
+    weight = fields.Float(digits="Stock Weight")
+
+    # Fixing bug https://github.com/odoo/odoo/issues/34702
+    # and take into account the weight of the packaging
+    # WARNING: this method _compute_weight() is also inherited by the OCA module
+    # base_delivery_carrier_label so if you use that module, you should copy
+    # that piece of code in a custom module that depend on delivery_usability
+    # and base_delivery_carrier_label
+    def _compute_weight(self):
+        smlo = self.env["stock.move.line"]
+        weight_uom_categ = self.env.ref("uom.product_uom_categ_kgm")
+        kg_uom = self.env.ref("uom.product_uom_kgm")
+        weight_prec = self.env['decimal.precision'].precision_get('Stock Weight')
+        for package in self:
+            # if the weight of the package has been measured,
+            # it is written in shipping_weight
+            if not float_is_zero(package.shipping_weight, precision_digits=weight_prec):
+                weight = package.shipping_weight
+            # otherwise, we compute the theorical weight from the weight of the products
+            # and the weight of the packaging
+            # Since Odoo v11, consu products don't create quants, so I can't loop
+            # on pack.quant_ids to get all the items inside a package: I have to
+            # get the picking, then loop on the stock.move.line of that picking
+            # linked to that package
+            else:
+                weight = 0.0
+                # the package can be seen in a return
+                # So I get the picking of it's first appearance
+                domain = [
+                    ("result_package_id", "=", package.id),
+                    ("product_id", "!=", False),
+                    ]
+                first_move_line = smlo.search(
+                    domain + [('picking_id', '!=', False)], limit=1, order='id')
+                if first_move_line:
+                    picking_id = first_move_line.picking_id.id
+                    current_picking_move_line_ids = smlo.search(
+                        domain + [("picking_id", "=", picking_id)])
+                    for ml in current_picking_move_line_ids:
+                        if ml.product_uom_id.category_id == weight_uom_categ:
+                            weight += ml.product_uom_id._compute_quantity(
+                                ml.qty_done, kg_uom
+                            )
+                        else:
+                            weight += (
+                                ml.product_uom_id._compute_quantity(
+                                    ml.qty_done, ml.product_id.uom_id
+                                )
+                                * ml.product_id.weight
+                            )
+                if package.packaging_id:
+                    weight += package.packaging_id.weight
+            package.weight = weight