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Previously we supported one level of nested parentheses inside of a
`:host()` selector, e.g. `:host(:not(p))`. This caused a breakage in g3
when I migrated a selector from `:host:not(:has(p))` to
`:host(:not(:has(p)))`. This change adds support for just one more level
of nesting.
It'd be nice to move everything to a real CSS parser (or even update it
to count parentheses like I did with :host-context()), but I wasn't able
to get that to work in ~20 minutes and I'm focusing on other things at
the moment.
This change punts the problem until somebody tries to use just one more
level of nesting in a selector.
Fixes #64830
(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 | ||