Sale Invoice No Mail

When you use the standard sales flow to generate an invoice from a sale order, Odoo normally sends notification emails to the people following the invoice. This module changes that behaviour so those automatic emails are not sent.

• It works on the wizard used to create invoices from sale orders (the 'Create Invoice' action), including advance payment invoices.
• The invoice itself is still created exactly as before; only the automatic email notification is suppressed.
• The behaviour is applied by running the invoice creation with a setting that tells Odoo not to notify followers.
• Developers can override the decision through a dedicated hook method, but by default the emails are always skipped.

It touches the sale.advance.payment.inv wizard and, indirectly, the invoices generated from sale orders. No new menus, screens, buttons or reports are added, and no other business rules, checks or scheduled jobs are introduced. Users will simply notice that customers no longer receive an automatic email when an invoice is generated from a sale order.