[FIX] account: render rounding line

Steps to reproduce:
- create a cash rounding
- create an invoice
- in Other Infos, select the created Cash Rounding Method

Issue:
Accounting wise, everything works fine but the back-end view and the Invoice Reports do not take into account the rounding
(except wen you create a partial payment, the amount due is correct of course)

Solution:
Make sure the value `formatted_amount_total_rounded` is returned by the method `_prepare_tax_totals` so it can be used in the templates

opw-3090556

closes odoo/odoo#109312

X-original-commit: 5724858a374c894bf787b4381bdcd466b4cc2816
Signed-off-by: William André (wan) <wan@odoo.com>

addons/account/models/account_move.py

@@ -1168,6 +1168,10 @@ class AccountMove(models.Model):
                             handle_price_include=False,
                         ))
                 move.tax_totals = self.env['account.tax']._prepare_tax_totals(**kwargs)
+                rounding_line = move.line_ids.filtered(lambda l: l.display_type == 'rounding')
+                if rounding_line:
+                    amount_total_rounded = move.tax_totals['amount_total'] - rounding_line.balance
+                    move.tax_totals['formatted_amount_total_rounded'] = formatLang(self.env, amount_total_rounded, currency_obj=move.currency_id) or ''
             else:
                 # Non-invoice moves don't support that field (because of multicurrency: all lines of the invoice share the same currency)
                 move.tax_totals = None

addons/account/static/src/components/tax_totals/tax_totals.xml

@@ -75,6 +75,18 @@
                             name="amount_total"
                             t-att-class="Object.keys(totals.groups_by_subtotal).length > 0 ? 'oe_subtotal_footer_separator' : ''"
                             t-out="totals.formatted_amount_total"
+                            t-attf-style="{{ !totals.formatted_amount_total_rounded ? 'font-size: 1.3em; font-weight: bold; white-space: nowrap;' : 'font-size: 1em;' }}"
+                        />
+                    </td>
+                </tr>
+                <tr t-if="totals.formatted_amount_total_rounded">
+                    <td class="o_td_label">
+                        <label class="o_form_label o_tax_total_label">Total Rounded</label>
+                    </td>
+
+                    <td>
+                        <span
+                            t-out="totals.formatted_amount_total_rounded"
                             style="white-space: nowrap; font-weight: bold; font-size: 1.3em;"
                         />
                     </td>

addons/account/views/report_invoice.xml

@@ -282,13 +282,21 @@
                 <t t-call="account.tax_groups_totals"/>
             </t>
 
+            <t t-set="has_rounding" t-value="'formatted_amount_total_rounded' in tax_totals"/>
             <!--Total amount with all taxes-->
             <tr class="border-black o_total">
-                <td><strong>Total</strong></td>
+                <t t-if="has_rounding"><td>Total</td></t>
+                <t t-else=""><td><strong>Total</strong></td></t>
                 <td class="text-end">
                     <span t-out="tax_totals['formatted_amount_total']"/>
                 </td>
             </tr>
+            <tr t-if="has_rounding">
+                <td><strong>Total Rounded</strong></td>
+                <td class="text-end">
+                    <span t-esc="tax_totals['formatted_amount_total_rounded']"/>
+                </td>
+            </tr>
         </template>
 
         <template id="tax_groups_totals">