[FIX] mail: show bullet style of li in message content

Task-2447922

closes odoo/odoo#65071

Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/components/message/message.scss

@@ -45,11 +45,15 @@
     word-wrap: break-word;
     word-break: break-word;
 
-    * {
+    *:not(li):not(li div) {
         // Message content can contain arbitrary HTML that might overflow and break
         // the style without this rule.
+        // Lists are ignored because otherwise bullet style become hidden from overflow.
+        // It's acceptable not to manage overflow of these tags for the moment.
+        // It also excludes all div in li because 1st leaf and div child of list overflow
+        // may impact the bullet point (at least it does on Safari).
         max-width: 100%;
-        overflow: auto;
+        overflow-x: auto;
     }
 
     img {