Do not create a production request when quantities are the same

If the available quantity is exactly the same as the quantity sold, there is no
need to create a production request.

Closes #14585
(grafted from 61abfaa01954f661128f014171686a6512ffe630)

--HG--
branch : 8.0

modules/sale_supply_production/sale.py

@@ -89,7 +89,7 @@ class Line(metaclass=PoolMeta):
             available_qty = Uom.compute_qty(
                 product.default_uom, available_qty, self.unit,
                 round=False)
-            if quantity < available_qty:
+            if quantity <= available_qty:
                 product_quantities[product] -= Uom.compute_qty(
                     self.unit, quantity, product.default_uom, round=False)
                 return

modules/sale_supply_production/tests/scenario_sale_supply_production_stock_first.rst

@@ -104,3 +104,21 @@ Sale 4 products with production request::
     >>> move, = line.moves
     >>> move.state
     'staging'
+
+Sale remaining 2 products without production request::
+
+    >>> sale = Sale()
+    >>> sale.party = customer
+    >>> line = sale.lines.new()
+    >>> line.product = product
+    >>> line.quantity = 2
+    >>> sale.click('quote')
+    >>> sale.click('confirm')
+    >>> sale.state
+    'processing'
+    >>> line, = sale.lines
+    >>> len(line.productions)
+    0
+    >>> move, = line.moves
+    >>> move.state
+    'draft'