scrollIntoView() does not work on option elements

[smfr]

98069e5

scrollIntoView() does not work on option elements
https://bugs.webkit.org/show_bug.cgi?id=243517
<rdar://98475444>

Reviewed by Ryosuke Niwa.

<option> and <optgroup> are special because they don't have their own renderers;
they get painted as items by their enclosing <select> element.

Because of this `scrollIntoView()` on these elements did nothing, since `Element::scrollIntoView()`
returned early if there is no renderer.

Fix in a similar way to how `Element::getClientRects()` is implemented: add special
handling when the element is an HTMLOptionElement or HTMLOptGroupElement. `listBoxElementScrollIntoView()`
first handles the scroll in the <select>, then allows the existing call to `FrameView::scrollRectToVisible()`
to scroll the enclosing scrollers.

* LayoutTests/fast/scrolling/scrollIntoView-on-option-expected.txt: Added.
* LayoutTests/fast/scrolling/scrollIntoView-on-option.html: Added.
* LayoutTests/platform/ios-wk2/fast/scrolling/scrollIntoView-on-option-expected.txt: on iOS, the
<select> is rendered as a menu list, so the <option> has no visible representation to scroll to,
and no scrolling occurs. This matches the behavior for a menulist on macOS in all browsers.
* Source/WebCore/dom/Element.cpp:
(WebCore::listBoxElementScrollIntoView):
(WebCore::Element::scrollIntoView):

Canonical link: https://commits.webkit.org/253585@main

f256ac0

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 4bebe69)

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

[webkit-early-warning-system]

f256ac0

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

[webkit-commit-queue]

Committed 253585@main (98069e5): https://commits.webkit.org/253585@main

Reviewed commits have been landed. Closing PR #3438 and removing active labels.