[UIAsyncTextInput] [WebKit] Adopt API replacements for UITextSuggesti…

…onDelegate

https://bugs.webkit.org/show_bug.cgi?id=265097
rdar://118589483

Reviewed by Megan Gardner.

Replace calls to `-[UITextInputSuggestionDelegate setSuggestions:]` with
`-[UIAsyncTextInputDelegate provideCandidateUISuggestions:]`, which provides equivalent
functionality. No change in behavior.

* Source/WebKit/Platform/spi/ios/UIKitSPI.h:
* Source/WebKit/UIProcess/ios/WKContentViewInteraction.h:
* Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm:
(-[WKFormInputSession invalidate]):
(-[WKContentView updateTextSuggestionsForInputDelegate]):
(-[WKContentView _provideSuggestionsToInputDelegate:]):

Canonical link: https://commits.webkit.org/271120@main

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

@@ -1264,6 +1264,7 @@ typedef struct {
 @protocol UIAsyncTextInputDelegate_Staging<UIAsyncTextInputDelegate>
 - (void)invalidateTextEntryContext; // Added in rdar://118536368.
 - (void)replaceText:(id)sender; // Added in rdar://118307558.
+- (void)provideCandidateUISuggestions:(NSArray<UITextSuggestion*> *)suggestions; // Added in rdar://117914235.
 @end
 
 #endif // HAVE(UI_ASYNC_TEXT_INTERACTION)

Source/WebKit/UIProcess/ios/WKContentViewInteraction.h

@@ -688,6 +688,7 @@ FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(DECLARE_WKCONTENTVIEW_ACTION_FOR_WEB_VIEW)
 - (void)_didNotHandleTapAsClick:(const WebCore::IntPoint&)point;
 - (void)_didHandleTapAsHover;
 - (void)_didCompleteSyntheticClick;
+- (void)_provideSuggestionsToInputDelegate:(NSArray<UITextSuggestion *> *)suggestions;
 
 - (void)_didGetTapHighlightForRequest:(WebKit::TapIdentifier)requestID color:(const WebCore::Color&)color quads:(const Vector<WebCore::FloatQuad>&)highlightedQuads topLeftRadius:(const WebCore::IntSize&)topLeftRadius topRightRadius:(const WebCore::IntSize&)topRightRadius bottomLeftRadius:(const WebCore::IntSize&)bottomLeftRadius bottomRightRadius:(const WebCore::IntSize&)bottomRightRadius nodeHasBuiltInClickHandling:(BOOL)nodeHasBuiltInClickHandling;
 

Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm

@@ -830,9 +830,7 @@ - (BOOL)requiresStrongPasswordAssistance
 
 - (void)invalidate
 {
-    id <UITextInputSuggestionDelegate> suggestionDelegate = (id <UITextInputSuggestionDelegate>)[_contentView inputDelegate];
-    [suggestionDelegate setSuggestions:nil];
-    _contentView = nil;
+    [std::exchange(_contentView, nil) _provideSuggestionsToInputDelegate:nil];
 }
 
 - (void)reloadFocusedElementContextView
@@ -8750,21 +8748,30 @@ - (void)setDataListTextSuggestions:(NSArray<UITextSuggestion *> *)textSuggestion
 - (void)updateTextSuggestionsForInputDelegate
 {
     // Text suggestions vended from clients take precedence over text suggestions from a focused form control with a datalist.
-    id <UITextInputSuggestionDelegate> inputDelegate = (id <UITextInputSuggestionDelegate>)self.inputDelegate;
     NSArray<UITextSuggestion *> *formInputSessionSuggestions = [_formInputSession suggestions];
     if (formInputSessionSuggestions.count) {
-        [inputDelegate setSuggestions:formInputSessionSuggestions];
+        [self _provideSuggestionsToInputDelegate:formInputSessionSuggestions];
         return;
     }
 
 #if ENABLE(DATALIST_ELEMENT)
     if ([_dataListTextSuggestions count]) {
-        [inputDelegate setSuggestions:_dataListTextSuggestions.get()];
+        [self _provideSuggestionsToInputDelegate:_dataListTextSuggestions.get()];
         return;
     }
 #endif
 
-    [inputDelegate setSuggestions:nil];
+    [self _provideSuggestionsToInputDelegate:nil];
+}
+
+- (void)_provideSuggestionsToInputDelegate:(NSArray<UITextSuggestion *> *)suggestions
+{
+#if HAVE(UI_ASYNC_TEXT_INTERACTION)
+    if (self.shouldUseAsyncInteractions)
+        [_asyncSystemInputDelegate provideCandidateUISuggestions:suggestions];
+    else
+#endif
+        [(id<UITextInputSuggestionDelegate>)self.inputDelegate setSuggestions:suggestions];
 }
 
 - (void)_showPlaybackTargetPicker:(BOOL)hasVideo fromRect:(const WebCore::IntRect&)elementRect routeSharingPolicy:(WebCore::RouteSharingPolicy)routeSharingPolicy routingContextUID:(NSString *)routingContextUID