This update improves how event registration badge design snippets are managed, making them available consistently after being added and avoiding situations where users could not remove them. It affects event website pages, event sales integration, and badge report templates, helping teams customize attendee materials more reliably.

...lable, once you drag and drop a snippet, no way to remove it..

When records have the same configured sorting values, Odoo now consistently keeps them in the order they were entered. This makes lists more predictable for users and avoids unexpected ordering differences caused by the database.

When a model has an _order attribute, results need to be ordered by that AND id, to respect the order in which the records were entered.
Users expect record order to be kept when all other sort fields are equal, and PostgrSQL does not guarantee that.

Feature suggested by @mart-e in https://github.com/odoo/odoo/pull/6074#issuecomment-101669152