Localised copy doesn't trigger when ClassName changes

This may be an edge case but it's quite important for the Fluent + Elemental setup

Test setup

Page - "out of the box" model type
CustomPage - page with a has_one relation which uses localised_copy and this relation is automatically populated when a page is created (like ElementalArea)

• Create new Page, localise in int and us
• Current locale is int
• Change Page class to CustomPage and save
• This triggers the relation to be populated for the int locale but not for the us locale

The most common case is ElementalArea as this model is automatically attached when ClassName is changed (as the page relation becomes available).

Possible solution

Something like if we have localised_copy setup then we wold search for all localised records of the current model and check if this relation is populated. If it's not populated we would duplicate the related model from the current locale and attach. This should happen onAfterWrite(). We should probably use writeWithoutVersion or raw query if needed to attach relations.