[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 +1,17 @@
+# Copyright 2023 Jacques-Etienne Baudoux (BCIM) <je@bcim.be>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+
+from odoo import fields, models
+
+
+class StockMove(models.Model):
+    _inherit = "stock.move"
+
+    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