Before this commit when a website page was deleted, its related website
menu was deleted inside the database only through the ondelete="cascade"
of the Many2one relationship. This however did not perform the menu
cleanup on the ORM side.
This caused problems when the related menu id was kept in cache by
website's _get_menu_ids(), because the record could not be fetched
anymore. E.g. deleting a website-specific version of the "Contact Us"
page caused the problem, making the menu bar non renderable on all
pages.
After this commit the caches are cleared when a page is unlinked to
avoid this problem.
task-2686221
closesodoo/odoo#80348
X-original-commit: dd9997753d442f8923b31c3ceaa0cd29b09a06b2
Signed-off-by: Romain Derie (rde) <rde@odoo.com>