[IMP] mrp_production_date_planned_finished: add extensibility hook

mrp_production_date_planned_finished/models/mrp_production.py

@@ -10,12 +10,24 @@
 class MrpProduction(models.Model):
     _inherit = "mrp.production"
 
+    def _get_date_planned_start_using_delays(self):
+        warehouse = self.picking_type_id.warehouse_id
+        date_planned_start = self.date_planned_finished
+        if hasattr(warehouse, "calendar_id") and warehouse.calendar_id:
+            # See `mrp_warehouse_calendar` module.
+            delay = self.product_id.produce_delay + self.company_id.manufacturing_lead
+            date_planned_start = warehouse.calendar_id.plan_days(
+                -1 * (delay + 1), date_planned_start
+            )
+        else:
+            date_planned_start -= relativedelta(days=self.product_id.produce_delay)
+            date_planned_start -= relativedelta(days=self.company_id.manufacturing_lead)
+        return date_planned_start
+
     @api.onchange("date_planned_finished")
     def _onchange_date_planned_finished_set_date_planned_start(self):
         if self.date_planned_finished and not self.is_planned:
-            date_planned_start = self.date_planned_finished
-            date_planned_start -= relativedelta(days=self.product_id.produce_delay)
-            date_planned_start -= relativedelta(days=self.company_id.manufacturing_lead)
+            date_planned_start = self._get_date_planned_start_using_delays()
             if date_planned_start == self.date_planned_finished:
                 date_planned_start -= relativedelta(hours=1)
             if self.date_planned_start != date_planned_start: