We use a hook_ENTITY_TYPE_access() to restrict access to editing some menu links.
It works fine but the Edit button is still displayed when editing the menu, so it is confusing for users.
Create a hook like this:
function foo_menu_link_content_access(MenuLinkContentInterface $entity, string $operation) {
if (in_array($operation, ['update', 'delete'])) {
return AccessResult::forbidden();
}
}
Then browse to /admin/structure/menu/manage/yourmenu.
MenuForm::buildOverviewTreeForm() should check access to each link before adding the operation.
I will submit a patch.
Needs work
9.5
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The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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This will need a test case to show the issue please