stock_usability: clean-up zero-qty quants when opening quants from stock.location

When accessing stock.move.line from the show reservation on quants, in
the form view of stock.move.line, have a link to the picking

stock_usability/models/__init__.py

@@ -1,6 +1,7 @@
 from . import stock_move
 from . import stock_picking
 from . import stock_picking_type
+from . import stock_location
 from . import stock_location_route
 from . import stock_warehouse_orderpoint
 from . import stock_quant

stock_usability/models/stock_location.py

@@ -0,0 +1,14 @@
+# Copyright 2023 Akretion France (http://www.akretion.com)
+# @author Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class StockLocation(models.Model):
+    _inherit = 'stock.location'
+
+    def action_show_quants(self):
+        self.ensure_one()
+        action = self.env['stock.quant']._get_quants_action(domain=[('location_id', 'child_of', self.id)])
+        return action

stock_usability/models/stock_quant.py

@@ -24,5 +24,5 @@ class StockQuant(models.Model):
             ('package_id', '=', self.package_id.id or False),
             ('result_package_id', '=', self.package_id.id or False),
         ]
-        action['context'] = {'create': 0}
+        action['context'] = {'create': 0, 'stock_move_line_main_view': True}
         return action

stock_usability/views/stock_location.xml

@@ -40,6 +40,10 @@
                 string="Reordering Rules"
                 class="oe_stat_button" icon="fa-refresh"/>
         </div>
+        <button name="%(stock.location_open_quants)d" position="attributes">
+            <attribute name="type">object</attribute>
+            <attribute name="name">action_show_quants</attribute>
+        </button>
     </field>
 </record>
 

stock_usability/views/stock_move.xml

@@ -73,6 +73,17 @@
     <field name="context">{'search_default_done': 1}</field>
 </record>
 
+<record id="view_move_line_form" model="ir.ui.view">
+    <field name="name">stock_usability.stock.move.line.form</field>
+    <field name="model">stock.move.line</field>
+    <field name="inherit_id" ref="stock.view_move_line_form" />
+    <field name="arch" type="xml">
+        <field name="reference" position="before">
+            <field name="picking_id" invisible="not context.get('stock_move_line_main_view')"/>
+        </field>
+    </field>
+</record>
+ 
 <record id="view_move_line_tree" model="ir.ui.view">
     <field name="name">stock_usability.stock.move.line.tree</field>
     <field name="model">stock.move.line</field>