[Async text interaction] Enable selection autoscrolling, and reveal the edit menu after scrolling

[whsieh]

92399f9

[Async text interaction] Enable selection autoscrolling, and reveal the edit menu after scrolling
https://bugs.webkit.org/show_bug.cgi?id=264337

Reviewed by Megan Gardner.

This patch works towards additional support for async text interaction (and input client), by
adding plumbing for the following:

1.  Plumbing to autoscroll to a given `point` in content view coordinates.
2.  Logic to reveal the edit menu after scrolling or zooming, only if the edit menu was previously
    presented. To know this, we add a new flag on the content view to keep track of whether the edit
    menu has been fully presented.

* Source/WebKit/Platform/spi/ios/UIKitSPI.h:

Add an SPI method declaration here, only so that we can call super in our existing implementation of
`-interactionAssistant`.

* Source/WebKit/UIProcess/ios/WKContentViewInteraction.h:
* Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm:
(-[WKContentView interactionAssistant]):
(-[WKContentView willPresentEditMenuWithAnimator:]):
(-[WKContentView willDismissEditMenuWithAnimator:]):

Keep track of `_isPresentingEditMenu`, so that we can consult it in the `WKTextInteractionWrapper`
below to conditionally restore edit menu visibility.

(-[WKContentView isPresentingEditMenu]):
(-[WKContentView autoscrollToPoint:]):
(-[WKContentView cancelAutoscroll]):

Implement a new method to hook into platform selection autoscrolling support using
`UIAsyncTextInputClient`.

* Source/WebKit/UIProcess/ios/WKTextInteractionWrapper.mm:
(SOFT_LINK_CLASS_OPTIONAL):
(-[WKTextInteractionWrapper initWithView:]):
(-[WKTextInteractionWrapper willStartScrollingOverflow]):
(-[WKTextInteractionWrapper didEndScrollingOverflow]):
(-[WKTextInteractionWrapper willStartScrollingOrZooming]):
(-[WKTextInteractionWrapper didEndScrollingOrZooming]):

Canonical link: https://commits.webkit.org/270343@main

1e1e9f3

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 1ffb9ee)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	❌ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
	❌ 🛠 ios-sim	✅ 🛠 mac-AS-debug	⏳ 🧪 wpe-wk2
✅ 🧪 webkitperl	❌ 🧪 ios-wk2	🧪 api-mac	✅ 🛠 gtk
	❌ 🧪 ios-wk2-wpt		🧪 gtk-wk2
	❌ 🧪 api-ios	🧪 mac-wk2	🧪 api-gtk
	❌ 🛠 tv	🧪 mac-AS-debug-wk2
	❌ 🛠 tv-sim
	❌ 🛠 watch		⏳ 🛠 jsc-mips
	❌ 🛠 watch-sim		⏳ 🧪 jsc-mips-tests

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 23fdf01)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	⏳ 🧪 wpe-wk2
✅ 🧪 webkitperl	❌ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	✅ 🧪 ios-wk2-wpt		✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
	✅ 🛠 watch		⏳ 🛠 jsc-mips
	✅ 🛠 watch-sim		⏳ 🧪 jsc-mips-tests

[whsieh]

ios-wk2 failures are legit — need to move the -cancelAutoscroll method back out of the HAVE(UI_ASYNC_TEXT_INTERACTION) section.

[webkit-early-warning-system]

EWS run on current version of this PR (hash 1e1e9f3)

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

[webkit-commit-queue]

Committed 270343@main (92399f9): https://commits.webkit.org/270343@main

Reviewed commits have been landed. Closing PR #20104 and removing active labels.