REGRESSION (iOS 16): <optgroup> labels are duplicated

https://bugs.webkit.org/show_bug.cgi?id=247443
rdar://101241715

Reviewed by Wenson Hsieh.

WebKit displays <optgroup> elements as inline submenus. Prior to iOS 16, UIKit
did not display titles for inline submenus. Consequently, WebKit inserted a
disabled menu item at the top of each submenu, containing the <optgroup>'s
label.

However, UIKit began displaying titles for submenus in iOS 16, resulting in
duplicate labels. To fix, remove the labels added by WebKit.

* Source/WebKit/UIProcess/ios/forms/WKFormSelectPicker.mm:
(-[WKSelectPicker createMenu]):
(-[WKSelectPicker actionForOptionIndex:]):

Canonical link: https://commits.webkit.org/256324@main

Source/WebKit/UIProcess/ios/forms/WKFormSelectPicker.mm

@@ -564,12 +564,6 @@ - (UIMenu *)createMenu
             NSString *groupText = optionItem.text;
             NSMutableArray *groupedItems = [NSMutableArray array];
 
-            if (groupText.length) {
-                UIAction *action = [UIAction actionWithTitle:groupText image:nil identifier:nil handler:^(UIAction *action) { }];
-                action.attributes = UIMenuElementAttributesDisabled;
-                [groupedItems addObject:action];
-            }
-
             currentIndex++;
             while (currentIndex < _view.focusedSelectElementOptions.size()) {
                 auto& childOptionItem = _view.focusedSelectElementOptions[currentIndex];
@@ -628,10 +622,6 @@ - (UIAction *)actionForOptionIndex:(NSInteger)optionIndex
         UIMenu *groupedMenu = (UIMenu *)menuElement;
         NSUInteger numGroupedOptions = groupedMenu.children.count;
 
-        // The first child of a grouped menu with a title represents the title, and is not a selectable option.
-        if (groupedMenu.title.length)
-            numGroupedOptions--;
-
         if (currentIndex + numGroupedOptions <= (NSUInteger)optionIndex)
             currentIndex += numGroupedOptions;
         else