base-select option hover style clipping with rotated transforms

[annevk]

944721a

base-select option hover style clipping with rotated transforms
https://bugs.webkit.org/show_bug.cgi?id=311402
rdar://171933742

Reviewed by NOBODY (OOPS!).

In https://patrickbrosset.com/lab/custom-select/folders/ the options
drawn outside the ::picker(select) rectangle have their :hover effect
clipped by the rectangle.

Strangely enough the cause of this is anchor positioning calling layout
too often and invalidating all the time.

(The hasRealAnchor change is only needed for picker-bug-no-select.html.
The other changes are needed for picker-bug-minimal.html.)

944721a

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	❌ 🧪 wpe-wk2	❌ 🧪 win-tests	🛠 mac-apple
✅ 🧪 webkitperl	❌ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		✅ 🛠 vision-apple
	❌ 🧪 ios-wk2-wpt	✅ 🧪 api-mac-debug	✅ 🛠 gtk3-libwebrtc
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🛠 gtk
	❌ 🛠 ios-safer-cpp	❌ 🧪 mac-wk2	❌ 🧪 gtk-wk2
	✅ 🛠 vision	❌ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🛠 playstation
	✅ 🧪 vision-wk2	❌ 🧪 mac-intel-wk2
	✅ 🛠 tv	❌ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash 944721a)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	❌ 🧪 wpe-wk2	❌ 🧪 win-tests	🛠 mac-apple
✅ 🧪 webkitperl	❌ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		✅ 🛠 vision-apple
	❌ 🧪 ios-wk2-wpt	✅ 🧪 api-mac-debug	✅ 🛠 gtk3-libwebrtc
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🛠 gtk
	❌ 🛠 ios-safer-cpp	❌ 🧪 mac-wk2	❌ 🧪 gtk-wk2
	✅ 🛠 vision	❌ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🛠 playstation
	✅ 🧪 vision-wk2	❌ 🧪 mac-intel-wk2
	✅ 🛠 tv	❌ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-ews-buildbot]

macOS Safer C++ Build #91680 (944721a)

❌ Found 1 failing file with 1 issue. Please address these issues before landing. See WebKit Guidelines for Safer C++ Programming.
(cc @rniwa)

[webkit-ews-buildbot]

iOS Safer C++ Build #10630 (944721a)

❌ Found 1 failing file with 1 issue. Please address these issues before landing. See WebKit Guidelines for Safer C++ Programming.
(cc @rniwa)