OverlayRegions should handle OverflowScrollProxyNodes correctly

[etiennesegonzac]

211c2ae

OverlayRegions should handle OverflowScrollProxyNodes correctly
https://bugs.webkit.org/show_bug.cgi?id=294408
<rdar://141299377>

Reviewed by Simon Fraser.

When configuring a ScrollView for OverlayRegions, associate the layers
for any overflow related node (scrolling proxy).

* Source/WebKit/UIProcess/API/ios/WKWebViewIOS.mm:
(configureScrollViewWithOverlayRegionsIDs):
Call the new `_associateRelatedLayersForOverlayRegions`.
(-[WKWebView _selectOverlayRegionScrollView:]):
(-[WKWebView _resetOverlayRegions]):
(-[WKWebView _updateOverlayRegions:destroyedLayers:]):
Update method signatures for the new `OverlayRegionCandidatesMap`.

* Source/WebKit/UIProcess/RemoteLayerTree/ios/RemoteScrollingCoordinatorProxyIOS.h:
* Source/WebKit/UIProcess/RemoteLayerTree/ios/RemoteScrollingCoordinatorProxyIOS.mm:
(WebKit::RemoteScrollingCoordinatorProxyIOS::overlayRegionCandidates const):
(WebKit:: const): Deleted.
The `overlayRegionCandidates` method now returns a Map with the associated
layers for overflow related nodes.

* Source/WebKit/UIProcess/ios/WKBaseScrollView.h:
* Source/WebKit/UIProcess/ios/WKBaseScrollView.mm:
(-[WKBaseScrollView _associateRelatedLayersForOverlayRegions:with:]):
Add a stub for the new method in Additions.

* Source/WebKit/UIProcess/API/ios/WKWebViewTestingIOS.mm:
(dumpUIView):
Add an associated layers count to the dump format.
* LayoutTests/overlay-region/full-page-overflow-expected.txt:
* LayoutTests/overlay-region/full-page-overflow-scrolling-expected.txt:
* LayoutTests/overlay-region/snapping-expected.txt:
Update tests expectations with associated layers.
* LayoutTests/overlay-region/overflow-with-proxy-expected.txt: Added.
* LayoutTests/overlay-region/overflow-with-proxy.html: Added.
Add a new test.

Canonical link: https://commits.webkit.org/296201@main

86af715

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	⏳ 🧪 win-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash bc84763)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	⏳ 🧪 win-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt		✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[smfr]

Can we write some tests?

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 0cc934c)

Details

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

[smfr]

auto&

[webkit-early-warning-system]

EWS run on current version of this PR (hash 86af715)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
🧪 style	⏳ 🛠 ios	🛠 mac	🛠 wpe	⏳ 🛠 win
🧪 bindings	⏳ 🛠 ios-sim	⏳ 🛠 mac-AS-debug	🧪 wpe-wk2	⏳ 🧪 win-tests
🧪 webkitperl	⏳ 🧪 ios-wk2	🧪 api-mac	🧪 api-wpe
	⏳ 🧪 ios-wk2-wpt	🧪 mac-wk1	⏳ 🛠 wpe-cairo
⏳ 🛠 🧪 jsc	⏳ 🧪 api-ios	🧪 mac-wk2	🛠 gtk
	⏳ 🛠 vision	⏳ 🧪 mac-AS-debug-wk2	🧪 gtk-wk2
	⏳ 🛠 vision-sim	🧪 mac-wk2-stress	🧪 api-gtk
	⏳ 🧪 vision-wk2	🧪 mac-intel-wk2	⏳ 🛠 playstation
	⏳ 🛠 tv	⏳ 🛠 mac-safer-cpp
	⏳ 🛠 tv-sim
	⏳ 🛠 watch
	⏳ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash 86af715)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	⏳ 🧪 win-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 296201@main (211c2ae): https://commits.webkit.org/296201@main

Reviewed commits have been landed. Closing PR #46676 and removing active labels.