As contributor, I can add a group of domains (and not only domains) in a group of domains

[MaartenLMEM]

Example : "Habillement et prêt à porter" will contain group of domains "Habillement luxe homme" et "habillement luxe mixte + other domains

Please first size it and we ll see

[lutangar]

I'd say Size S 👕 as long as we stick to one level of recursion... but there might not be validation everywhere to ensure that's actually the case. We'll only fetch domainSets inside a domainSet and that's it.

This will also generate more matchintContext so might be a performance impact.

This is handle backend side so I'd say there are no impact on any frontend side.

[MaartenLMEM]

From my contributor point of view, this 1st level would be useful.
@lutangar Do you see any risk of breaking something, or are you completely confident in and outs of this feature ?

but there might not be validation everywhere to ensure that's actually the case.

Idea : To be sure there is no mistake we will write "2nd" (for 2nd level) in each title of a group of domain that contains other groups.

[lutangar]

Just a warning note on the MatchingContext v4 normalizer wich probably need fixing already...
V4 should use $matchingContext->getFullUrlRegex($this->escaper) as in v3

[MaartenLMEM]

Postponed.