Reset and cancel shipment when purchase request is cancelled

The stock moves of the linked sale line is cancelled so the linked shipment
state must be updated to synchronize the inventory moves or to cancel it.

Closes #12825
(grafted from ced7b09694dd5f0eb513ad014ee4cff0c979073e)

--HG--
branch : 6.0

modules/sale_supply/purchase.py

@@ -85,15 +85,29 @@ class HandlePurchaseCancellationException(metaclass=PoolMeta):
         pool = Pool()
         SaleLine = pool.get('sale.line')
         Move = pool.get('stock.move')
+        Shipment = pool.get('stock.shipment.out')
 
         next_state = super(HandlePurchaseCancellationException,
             self).transition_cancel_request()
         moves = []
+        shipments = set()
         for sub_ids in grouped_slice(list(map(int, self.records))):
             sale_lines = SaleLine.search([
                     ('purchase_request', 'in', sub_ids),
                     ])
-            moves += [m for line in sale_lines for m in line.moves]
+            for sale_line in sale_lines:
+                moves.extend(sale_line.moves)
+                for shipment in sale_line.sale.shipments:
+                    if shipment.state in ['draft', 'waiting']:
+                        shipments.add(shipment)
         if moves:
+            shipments_waiting = [s for s in shipments if s.state == 'waiting']
+            Shipment.draft(shipments)  # clear inventory moves
             Move.cancel(moves)
+            Shipment.wait([
+                    s for s in shipments_waiting
+                    if any(m.state != 'cancelled' for m in s.outgoing_moves)])
+            Shipment.cancel([
+                    s for s in shipments_waiting
+                    if all(m.state == 'cancelled' for m in s.outgoing_moves)])
         return next_state