Reported by VFE, odoo/odoo#54564 missed one of the use cases in menus:
normally a menu can have *either* sub-menus or an action (aka only
"leaf" menu items can have actions), however there's an exception for
root (application) menus: those can have an action, which is used as
the application's action, that is, what gets executed when opening the
application itself.
* root menus were already special cased (to allow a ``web_icon``),
expand this to allow both action and submenus
* modify the alternatives -- submenu-items and menuitems with a parent
-- so they keep the behavior of allowing *either* an action or
children
closesodoo/odoo#55144
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>
Xavier Morel
37a7aed189