[Webkit-unassigned] [Bug 244149] New: REGRESSION (iOS 16): New context menu (UIEditMenuInteraction) can't be disabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244149

            Bug ID: 244149
           Summary: REGRESSION (iOS 16): New context menu
                    (UIEditMenuInteraction) can't be disabled
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: krevis at figma.com

In iPadOS 16 beta 6, WKWebView shows the system edit menu (via UIEditMenuInteraction) when you control-click or right-click or two-finger-click anywhere in the web view.

We have our own handling of these events, so we don't want that menu, but there appears to be no way to disable it, or customize it.

- Tried catching the `contextmenu` event and calling `preventDefault`, as shown in the example in the MDN docs: https://developer.mozilla.org/en-US/docs/Web/API/Element/contextmenu_event
  Example: https://codepen.io/krevis-figma/pen/yLKejBa
  This doesn't work. The handler fires but `preventDefault()` has no effect.

- Looked for relevant delegate methods, but there aren't any.
  The closest thing is these WKUIDelegate methods to be called when the menu appears and disappears, but that's all:
  https://bugs.webkit.org/show_bug.cgi?id=243102
  Those would only let us add animations alongside the menu, anyway. They wouldn't let us disable the menu or customize its items.

- Looked for any UIKit API to globally disable the new edit menu, but there's nothing.

Could we please have a way to disable this thing?  Ideally via calling `preventDefault()` on the `contextmenu` event?

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