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-rw-r--r--odoo/tools/mail.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/odoo/tools/mail.py b/odoo/tools/mail.py
index 026976e112b..a97c853ebd8 100644
--- a/odoo/tools/mail.py
+++ b/odoo/tools/mail.py
@@ -38,6 +38,7 @@ safe_attrs = clean.defs.safe_attrs | frozenset(
'data-o-mail-quote', # quote detection
'data-oe-model', 'data-oe-id', 'data-oe-field', 'data-oe-type', 'data-oe-expression', 'data-oe-translation-id', 'data-oe-nodeid',
'data-publish', 'data-id', 'data-res_id', 'data-interval', 'data-member_id', 'data-scroll-background-ratio', 'data-view-id',
+ 'data-class',
])