[IMP] stock: Avoid unneeded write in _enable_show_reserved method

As long as the framework is not able to avoid rewriting values that are already set, we must add checks to avoid triggering multiple processes linked to that value assignment.

Example:
https://github.com/odoo/odoo/blob/66c11acdbedf8d1bcae6deb8ec54c5da5a3ae16d/addons/stock/models/product_strategy.py#L111
https://github.com/odoo/odoo/blob/11d81b2145e95c50481101a63d3ad1d244279af4/addons/stock/models/stock_move.py#L302-L341
https://github.com/odoo/odoo/blob/daea3d4e10b8fc2c4840fff30474a1203eff55c2/addons/sale_stock/models/sale_order.py#L402-L418

It may be unusual for a field to compute stored depending on a non-stored, but the reality is this.

closes odoo/odoo#152026

X-original-commit: 123212a5f5598d91f31869c49ac8d28aba1f698a
Signed-off-by: William Henrotin (whe) <whe@odoo.com>

addons/stock/models/product_strategy.py

@@ -94,7 +94,7 @@ class StockPutawayRule(models.Model):
         out_locations = self.location_out_id
         if out_locations:
             self.env['stock.picking.type'].with_context(active_test=False)\
-                .search([('default_location_dest_id', 'in', out_locations.ids)])\
+                .search([('default_location_dest_id', 'in', out_locations.ids), ('show_reserved', '=', False)])\
                 .write({'show_reserved': True})
 
     def _get_putaway_location(self, product, quantity=0, package=None, packaging=None, qty_by_location=None):