[FIX] account: sign columns amount_untax and amount_tax

In the tree view for account.invoice, two columns are signed
(amount_total and residual) and two columns are not signed
(amount_untaxed and amount_tax).

Now, all the columns with numeric values are signed.

This commit reverts the commit : 622af0b7cc

opw-1964348

closes odoo/odoo#33097

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/account/models/account_invoice.py

@@ -70,6 +70,12 @@ class AccountInvoice(models.Model):
         self.amount_total_signed = self.amount_total * sign
         self.amount_untaxed_signed = amount_untaxed_signed * sign
 
+    def _compute_sign_taxes(self):
+        for invoice in self:
+            sign = invoice.type in ['in_refund', 'out_refund'] and -1 or 1
+            invoice.amount_untaxed_invoice_signed = invoice.amount_untaxed * sign
+            invoice.amount_tax_signed = invoice.amount_tax * sign
+
     @api.onchange('amount_total')
     def _onchange_amount_total(self):
         for inv in self:
@@ -324,8 +330,12 @@ class AccountInvoice(models.Model):
         store=True, readonly=True, compute='_compute_amount', track_visibility='always')
     amount_untaxed_signed = fields.Monetary(string='Untaxed Amount in Company Currency', currency_field='company_currency_id',
         store=True, readonly=True, compute='_compute_amount')
+    amount_untaxed_invoice_signed = fields.Monetary(string='Untaxed Amount in Invoice Currency', currency_field='currency_id',
+        readonly=True, compute='_compute_sign_taxes')
     amount_tax = fields.Monetary(string='Tax',
         store=True, readonly=True, compute='_compute_amount')
+    amount_tax_signed = fields.Monetary(string='Tax in Invoice Currency', currency_field='currency_id',
+        readonly=True, compute='_compute_sign_taxes')
     amount_total = fields.Monetary(string='Total',
         store=True, readonly=True, compute='_compute_amount')
     amount_total_signed = fields.Monetary(string='Total in Invoice Currency', currency_field='currency_id',

addons/account/views/account_invoice_view.xml

@@ -163,10 +163,10 @@
                     <field name="user_id"/>
                     <field name="date_due"/>
                     <field name="origin"/>
-                    <field name="amount_untaxed" string="Tax Excluded"/>
-                    <field name="amount_tax"/>
-                    <field name="amount_total_signed" string="Total"/>
-                    <field name="residual_signed" string="Amount Due"/>
+                    <field name="amount_untaxed_invoice_signed" string="Tax Excluded" sum="Total"/>
+                    <field name="amount_tax_signed" string="Tax" sum="Total"/>
+                    <field name="amount_total_signed" string="Total" sum="Total"/>
+                    <field name="residual_signed" string="Amount Due" sum="Amount Due"/>
                     <field name="currency_id" invisible="1"/>
                     <field name="company_currency_id" invisible="1"/>
                     <field name="state"/>