[macOS] Running layout tests in fast/forms leaves a popup visible in the top left of the window, breaking all typing

[pxlcoder]

69938db

[macOS] Running layout tests in fast/forms leaves a popup visible in the top left of the window, breaking all typing
https://bugs.webkit.org/show_bug.cgi?id=251740
rdar://104719873

Reviewed by Wenson Hsieh.

226753@main began swizzling methods on `NSMenu` and `NSCarbonMenuImpl` so that
tests that present system popups could be run simultaneously. To support this
behavior, layout tests never actually present popup menus. However, the class
of the underlying menu implementation is configuration dependent. This means
that the correct method is not always swizzled, resulting in popups being
presented unexpectedly.

To fix, obtain the underlying menu implementation at runtime, ensuring that
the correct method is swizzled.

* Tools/WebKitTestRunner/mac/TestControllerMac.mm:
(WTR::menuImplClass):
(WTR::TestController::platformInitialize):

Canonical link: https://commits.webkit.org/259872@main

b57aef7

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 b57aef7)

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 259872@main (69938db): https://commits.webkit.org/259872@main

Reviewed commits have been landed. Closing PR #9646 and removing active labels.