To reproduce the issue:
- Website > Add menu items to activate the "+" dropdown.
- Edit mode > The top menu disappears.
On `_activateContenteditable()`, The `initAutoMoreMenu` > `_adapt()`
mutations (changes to move the overflowing menu items to a "+" dropdown)
are recorded and rollbacked by the editor, leading to reset the top menu
to the step before removing the `.o_menu_loading` class.
Recording the `initAutoMoreMenu` mutations leads to some other issues:
On edit mode (without overflowing items):
- Website > Edit mode > The editor starts (before any updates) with an
extra "history step".
- Undo > The top menu disappears.
On edit mode (with "Mega Menu" items):
- Website > Edit mode > Edit text in a "Mega Menu" item > The top menu
disappears.
The goal of this commit is to fix this behaviour using the
`renderingClasses` filter (added in [1]) to prevent the `o_menu_loading`
class from being taken into account in the `filterMutationRecords()`.
[1]: The https://github.com/odoo/odoo/commit/1c25ddb42393b136cac2a0ee0b9b7280fd803e7d
opw-3146873
closesodoo/odoo#113016
X-original-commit: 96c9ebd26aabc3f99acf5d586746b05db7cf4953
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>