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:nth-child() (and its siblings) support complex expressions, e.g.
`:nth-child(2n of :is(.foo, .bar))`. Previously we'd choke because of
the `:is()`. Now, we reuse the `_parenSuffix` subexpression to match
nested parentheses the same way we do for :host() and :host-context().
Note that we only support 3 levels of nesting, so a selector like
`:nth-child(n of :is(:has(:not(.foo))))` will still break.
I'll say yet again that we really should add a proper parser so we stop
getting bug reports like this :)
Fixes #64913
(cherry picked from commit
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| .. | ||
| at_rules_spec.ts | ||
| host_and_host_context_spec.ts | ||
| keyframes_spec.ts | ||
| ng_deep_spec.ts | ||
| polyfills_spec.ts | ||
| process_rules_spec.ts | ||
| repeat_groups_spec.ts | ||
| shadow_css_spec.ts | ||
| utils.ts | ||