[FIX] stock: fix check of package all in move lines

The `groupby` function is used to builds groups of(product, lot) keys
and their corresponding move lines / quants. `groupby` groups
*consecutive* keys, which is why the input is sorted by the keys.

`sorted` on recordsets keys will not sort as we would expect in this
particular situation, as the comparison operators on records act as
Set Comparison operators on the record ids, i.e. to compare the sets
superset/subset relationships:

```
>>> env["product.product"].browse(1) < env["product.product"].browse(2)
False
>>> env["product.product"].browse(1) < env["product.product"].browse([1, 2])
True
```

Example of sorted on stock.move.line records, where the product id 7313
is both in the slots 4 and 12 instead of being consecutive:

```
>>> [l.product_id.id for l in sorted(lines, key=itemgetter('product_id'))]
[7436, 7437, 7352, 7423, 7313, 7351, 7423, 7424, 7320, 7398, 7312, 7352, 7313, 7436, 7437, 7442, 7443, 7320, 7423, 7424, 7318, 7396, 7368, 7355, 7316]
```

Now when we group by id the 2 ids 7313 are correctly placed together in
slots 1 and 2:

```
>>> [l.product_id.id for l in sorted(lines, key=attrgetter('product_id.id'))]
[7312, 7313, 7313, 7316, 7318, 7320, 7320, 7351, 7352, 7352, 7355, 7368, 7396, 7398, 7423, 7423, 7423, 7424, 7424, 7436, 7436, 7437, 7437, 7442, 7443]
```

This commit aims to sort by "id" of the related records, to ensure the
same (product, lot) couples are consecutive.

closes odoo/odoo#63541

Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>

addons/stock/models/stock_picking.py

@@ -4,7 +4,7 @@
 from ast import literal_eval
 from datetime import date
 from itertools import groupby
-from operator import itemgetter
+from operator import attrgetter, itemgetter
 import time
 
 from odoo import api, fields, models, SUPERUSER_ID, _
@@ -771,14 +771,15 @@ class Picking(models.Model):
         all_in = True
         pack_move_lines = self.move_line_ids.filtered(lambda ml: ml.package_id == package)
         keys = ['product_id', 'lot_id']
+        keys_ids = ["{}.id".format(fname) for fname in keys]
         precision_digits = self.env['decimal.precision'].precision_get('Product Unit of Measure')
 
         grouped_quants = {}
-        for k, g in groupby(sorted(package.quant_ids, key=itemgetter(*keys)), key=itemgetter(*keys)):
+        for k, g in groupby(sorted(package.quant_ids, key=attrgetter(*keys_ids)), key=itemgetter(*keys)):
             grouped_quants[k] = sum(self.env['stock.quant'].concat(*list(g)).mapped('quantity'))
 
         grouped_ops = {}
-        for k, g in groupby(sorted(pack_move_lines, key=itemgetter(*keys)), key=itemgetter(*keys)):
+        for k, g in groupby(sorted(pack_move_lines, key=attrgetter(*keys_ids)), key=itemgetter(*keys)):
             grouped_ops[k] = sum(self.env['stock.move.line'].concat(*list(g)).mapped('product_qty'))
         if any(not float_is_zero(grouped_quants.get(key, 0) - grouped_ops.get(key, 0), precision_digits=precision_digits) for key in grouped_quants) \
                 or any(not float_is_zero(grouped_ops.get(key, 0) - grouped_quants.get(key, 0), precision_digits=precision_digits) for key in grouped_ops):