Deprecate ARIA required ID references exist (in6db8)

[carlosapaduarte]

Deprecating the rule because the aria-controls attribute is no longer required by the combobox and scrollbar roles.
Decided by the CG in the August 21 meeting.

Closes issue(s):

• closes ARIA ID Reference Error Processing - Requires ACT review #2337

Need for Call for Review:
This will require a 2 weeks Call for Review << new rule, or substantial changes affecting a large number of test cases, if in doubt, use this.

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[giacomo-petri]

Hi @carlosapaduarte @WilcoFiers, I recommend waiting for w3c/aria#2604 before deprecating the rule (depending on the decision we may only need to update it).

[Jym77]

They are still required in ARIA 1.2, and ARIA 1.3 is only a draft.
Does that mean we are effectively moving to ARIA 1.3 already? Or just on a case-by-case basis? How does this ties with #2366 ? Should we accept 1.3 attributes in the rule?

[Jym77]

Call for Review ends on January 22nd.