Content shape alternate targeting a specific item with ContentItemId

[Piedone]

Is your feature request related to a problem? Please describe.

You can override the Content shape of a given content item with the Content__[Id] alternate, which is added in OrchardCore.Contents.Shapes. This is useful, but since it uses ContentItem.Id, i.e. the numeric ID of the item in the DB, it's not portable: an override will only apply with one specific DB, and if you move the content item (like import it) to another DB, it won't.

Describe the solution you'd like

Add a new alternate, Content__[ContentItemId], that uses the alphanumeric and portable ContentItem.ContentItemId. Also document it under https://docs.orchardcore.net/en/latest/docs/reference/modules/Templates/#content-templates.

We can keep the current alternate for backward compatibility, but it shouldn't really be used, so let's keep it undocumented.

Describe alternatives you've considered

Changing the existing alternate, but that would be a breaking change.

[sebastienros]

We had that in orchard 1, why not.

[Piedone]

Ooops, closed by mistake.

[MichaelPetrinolis]

Is this something that will be included in v2.0.0 ?

[Piedone]

Only if you contribute it ;).

[Piedone]

Related: #2866.