Selector filter fails to collect hash for the first simple selector in :is()

[anttijk]

8cee0c8

Selector filter fails to collect hash for the first simple selector in :is()
https://bugs.webkit.org/show_bug.cgi?id=250889
<rdar://problem/104469871>

Reviewed by Alan Baradlay.

Logic bug in https://commits.webkit.org/259089@main

Add testing support for selector filter hash collection and a basic unit test.

* LayoutTests/fast/selectors/selector-filter-hashes-expected.txt: Added.
* LayoutTests/fast/selectors/selector-filter-hashes.html: Added.
* Source/WebCore/css/CSSSelector.h:
* Source/WebCore/css/SelectorFilter.cpp:
(WebCore::SelectorFilter::collectSelectorHashes):

Collect from the first simple selector too when IncludeRightmost::Yes is set.

(WebCore::SelectorFilter::collectHashesForTesting):
* Source/WebCore/css/SelectorFilter.h:
* Source/WebCore/css/parser/CSSParser.h:
* Source/WebCore/testing/Internals.cpp:
(WebCore::Internals::selectorFilterHashCounts):
* Source/WebCore/testing/Internals.h:
* Source/WebCore/testing/Internals.idl:

Canonical link: https://commits.webkit.org/259144@main

58f0209

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	❌ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	❌ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	❌ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
✅ 🛠 🧪 merge	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash 58f0209)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	❌ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	❌ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	❌ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
✅ 🛠 🧪 merge	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 259144@main (8cee0c8): https://commits.webkit.org/259144@main

Reviewed commits have been landed. Closing PR #8869 and removing active labels.