Fix allow_mail_archived_partner causing system notifications to send emails

allow_mail_archived_partner/models/account_move_send.py

@@ -4,11 +4,39 @@ from odoo import models, api
 class AccountInvoiceSend(models.TransientModel):
     _inherit = "account.invoice.send"
 
+    @api.model
+    def default_get(self, fields):
+        """
+        Override default_get to pre-fill archived partners.
+        This is often called BEFORE _get_default_mail_partner_ids.
+        """
+        res = super().default_get(fields)
+        
+        # Check if we're in the right context
+        active_model = self.env.context.get('active_model')
+        active_ids = self.env.context.get('active_ids', [])
+        
+        if active_model == 'account.move' and active_ids:
+            # Get the moves with archived partners allowed
+            moves = self.env['account.move'].with_context(
+                active_test=False
+            ).browse(active_ids)
+            
+            # Collect all unique partners from the moves
+            partner_ids = set()
+            for move in moves:
+                if move.partner_id and move.partner_id.email:
+                    partner_ids.add(move.partner_id.id)
+            
+            if partner_ids:
+                res['partner_ids'] = [(6, 0, list(partner_ids))]
+        
+        return res
+
     @api.model
     def _get_default_mail_partner_ids(self, move, mail_template, mail_lang):
         """
-        Allow archived partners when sending invoices via
-        the 'Send by Email' wizard.
+        Also fix this method to include archived partners.
         """
         wiz = self.with_context(
             active_test=False,
@@ -18,3 +46,16 @@ class AccountInvoiceSend(models.TransientModel):
             AccountInvoiceSend,
             wiz
         )._get_default_mail_partner_ids(move, mail_template, mail_lang)
+    
+    def _get_mail_composer_values(self, move, template, partner_ids):
+        """
+        Ensure context is passed to mail composer.
+        """
+        return super(
+            AccountInvoiceSend,
+            self.with_context(
+                active_test=False,
+                include_archived_partners=True,
+                mail_notify_force=True,
+            )
+        )._get_mail_composer_values(move, template, partner_ids)