[FIX] base: return all the css attachments

When detecting if the assets where already preprocessed, the method
only the last asset type matching was returned and deleted.
In standard, it should not have any impact as all assets are of the
same type but it may be possible to mix it with external modules.

Sign CLA

closes odoo/odoo#79786

X-original-commit: 0c2f83f4a6c4603d107007ac77c94e6a2805cd81
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

odoo/addons/base/models/assetsbundle.py

@@ -538,7 +538,7 @@ class AssetsBundle(object):
 
     def is_css_preprocessed(self):
         preprocessed = True
-        attachments = None
+        old_attachments = self.env['ir.attachment']
         asset_types = [SassStylesheetAsset, ScssStylesheetAsset, LessStylesheetAsset]
         if self.user_direction == 'rtl':
             asset_types.append(StylesheetAsset)
@@ -549,6 +549,7 @@ class AssetsBundle(object):
             if assets:
                 assets_domain = self._get_assets_domain_for_already_processed_css(assets)
                 attachments = self.env['ir.attachment'].sudo().search(assets_domain)
+                old_attachments += attachments
                 for attachment in attachments:
                     asset = assets[attachment.url]
                     if asset.last_modified > attachment['__last_update']:
@@ -565,7 +566,7 @@ class AssetsBundle(object):
                 if outdated:
                     preprocessed = False
 
-        return preprocessed, attachments
+        return preprocessed, old_attachments
 
     def preprocess_css(self, debug=False, old_attachments=None):
         """