[FIX] mail: prevent safari from shrinking notification list items

Task-2388565

closes odoo/odoo#61968

X-original-commit: 49acaa4f5bf6ce48dec9285d4acce70a7d940d42
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/components/notification_list/notification_list_item.scss

@@ -4,6 +4,7 @@
 
 @mixin o-mail-notification-list-item-layout {
     display: flex;
+    flex: 0 0 auto; // Without this, Safari shrinks parent regardless of child content
     align-items: center;
     padding: map-get($spacers, 1);