IconViews used in buttons should be marked as decorative since they lack accessible labels

[oleq]

📝 Provide detailed reproduction steps (if any)

Even though toolbar buttons have their own labels, the icons used inside don't, and accessing them individually, e.g. using the "virtual cursor" feature offered by assistive technologies presents an accessibility issue.

❓ Possible solution

Icons that are used as a decoration should come with an aria-hidden attribute.

Possible questions

Should all IconView get aria-hidden or just those used in buttons/menus/dropdowns/lists? Frankly, I don't remember any place using IconView for anything other than decoration but who knows (3rd-party). It might be a BC so it needs consideration.

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