Sever opener link for windows with an openee on manual navigation

[bnham]

7c33c64

Sever opener link for windows with an openee on manual navigation
https://bugs.webkit.org/show_bug.cgi?id=270249
rdar://122506395

Reviewed by Chris Dumez.

When a parent window uses window.open to create a child window, and the child window isn't closed,
currently that causes all future navigations in the parent window to remain in the same process.

In the case of a cross-origin manual navigation (e.g. navigation via the address bar), it should be
safe to allow a process swap, as per the discussion here:

whatwg/html#5767 (comment)

Note that Safari already almost always already has this behavior even though we don't do this at the
engine level, since most location bar navigations occur in a new WKWebView. The new WKWebView has no
opener link to the openee and loads in a different process. So there shouldn't be any new
compatibility issues with doing this at the engine level as well.

See also 272321@main, where we did this for the opposite case (allowing a window with an opener to
process swap on a cross-origin manual navigation).

* Source/WebKit/UIProcess/WebProcessPool.cpp:
(WebKit::WebProcessPool::processForNavigationInternal):
* Tools/TestWebKitAPI/Tests/WebKitCocoa/ProcessSwapOnNavigation.mm:

Canonical link: https://commits.webkit.org/275565@main

edd3347

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

[webkit-early-warning-system]

EWS run on current version of this PR (hash edd3347)

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

[cdumez]

LGTM.

[webkit-commit-queue]

Committed 275565@main (7c33c64): https://commits.webkit.org/275565@main

Reviewed commits have been landed. Closing PR #25253 and removing active labels.