[IMP] proc_auto_create_grp_by_product: merge moves

Allow to merge moves having different date_deadline to pick everything
in one operation

procurement_auto_create_group_by_product/models/__init__.py

@@ -1,3 +1,4 @@
 from . import stock_rule
+from . import stock_move
 from . import procurement_group
 from . import product_product

procurement_auto_create_group_by_product/models/stock_move.py

@@ -0,0 +1,29 @@
+# Copyright 2023 Jacques-Etienne Baudoux (BCIM) <je@bcim.be>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+
+from itertools import groupby
+
+from odoo import models
+
+
+class StockMove(models.Model):
+    _inherit = "stock.move"
+
+    def _merge_moves(self, merge_into=False):
+        sorted_moves_by_rule = sorted(self, key=lambda m: m.rule_id.id)
+        res_moves = self.browse()
+        for _rule, move_list in groupby(
+            sorted_moves_by_rule, key=lambda m: m.rule_id.id
+        ):
+            moves = self.browse(m.id for m in move_list)
+            res_moves |= super(StockMove, moves)._merge_moves(merge_into=merge_into)
+        return res_moves
+
+    def _prepare_merge_moves_distinct_fields(self):
+        result = super()._prepare_merge_moves_distinct_fields()
+        if self.rule_id.auto_create_group_by_product:
+            # Allow to merge moves on a pick operation having different
+            # deadlines
+            if "date_deadline" in result:
+                result.remove("date_deadline")
+        return result