[IMP] stock: add new filter for inv.adj. lines

New search filter to display of inventory lines with `difference_qty`
(diff. between `theoretical_qty` and `product_qty`) different than zero.

Task #2043851

addons/stock/models/stock_inventory.py

@@ -306,7 +306,7 @@ class InventoryLine(models.Model):
         digits='Product Unit of Measure', readonly=True)
     difference_qty = fields.Float('Difference', compute='_compute_difference',
         help="Indicates the gap between the product's theoretical quantity and its newest quantity.",
-        readonly=True, digits='Product Unit of Measure')
+        readonly=True, digits='Product Unit of Measure', search="_search_difference_qty")
     inventory_date = fields.Datetime('Inventory Date', readonly=True,
         default=fields.Datetime.now,
         help="Last date at which the On Hand Quantity has been computed.")
@@ -504,6 +504,17 @@ class InventoryLine(models.Model):
             impacted_lines |= line
         impacted_lines.write({'product_qty': 0})
 
+    def _search_difference_qty(self, operator, value):
+        if operator == '=':
+            result = True
+        elif operator == '!=':
+            result = False
+        else:
+            raise NotImplementedError()
+        lines = self.search([('inventory_id', '=', self.env.context.get('default_inventory_id'))])
+        line_ids = lines.filtered(lambda line: float_is_zero(line.difference_qty, line.product_id.uom_id.rounding) == result).ids
+        return [('id', 'in', line_ids)]
+
     def _search_outdated(self, operator, value):
         if operator != '=':
             if operator == '!=' and isinstance(value, bool):

addons/stock/views/stock_inventory_views.xml

@@ -83,6 +83,8 @@
                 <field name="partner_id" groups="stock.group_tracking_owner"/>
                 <filter string="Outdated Theoretical Quantities"
                         name="outdated" domain="[('outdated', '=', True)]"/>
+                <filter string="Difference different than zero"
+                        name="difference" domain="[('difference_qty', '!=', '0')]"/>
                 <group  expand='0' string='Group by...'>
                    <filter string='Location' name="location" domain="[]" context="{'group_by' : 'location_id'}"/>
                    <filter string='Packaging' name="packaging" domain="[]" context="{'group_by' : 'package_id'}"/>