[IMP] product: reorder product attribute

Currently the user cannot modify the order as he adds new attribute to the product.
In this commit he will be able to do that

task-3451377

closes odoo/odoo#131514

Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/product/models/product_template_attribute_line.py

@@ -13,7 +13,7 @@ class ProductTemplateAttributeLine(models.Model):
     _rec_name = 'attribute_id'
     _rec_names_search = ['attribute_id', 'value_ids']
     _description = "Product Template Attribute Line"
-    _order = 'attribute_id, id'
+    _order = 'sequence, attribute_id, id'
 
     active = fields.Boolean(default=True)
     product_tmpl_id = fields.Many2one(
@@ -22,6 +22,7 @@ class ProductTemplateAttributeLine(models.Model):
         ondelete='cascade',
         required=True,
         index=True)
+    sequence = fields.Integer("Sequence", default=10)
     attribute_id = fields.Many2one(
         comodel_name='product.attribute',
         string="Attribute",

addons/product/views/product_template_views.xml

@@ -61,6 +61,7 @@
                     <field name="attribute_line_ids" widget="one2many" context="{'show_attribute': False}">
                         <tree string="Variants" editable="bottom" decoration-info="value_count &lt;= 1">
                             <field name="value_count" column_invisible="True"/>
+                            <field name="sequence" widget="handle"/>
                             <field name="attribute_id" readonly="id"/>
                             <field name="value_ids" widget="many2many_tags" options="{'no_create_edit': True, 'color_field': 'color'}" context="{'default_attribute_id': attribute_id, 'show_attribute': False}"/>
                             <button string="Configure" class="float-end btn-secondary"