[Webkit-unassigned] [Bug 272358] New: Warn apps that use KVC on WKWebViewConfiguration about future breakage

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=272358

            Bug ID: 272358
           Summary: Warn apps that use KVC on WKWebViewConfiguration about
                    future breakage
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nham at apple.com

We renamed some ivars in WKWebViewConfiguration in 276117 at main. This broke some poorly behaved apps that were accessing ivars on WKWebViewConfiguration via KVC. We'll temporarily allow these apps to continue to function for backwards compat reasons when linking against an older SDK, but log a fault when it happens. When linking against newer SDKs, Foundation will raise an exception about trying to use KVC against a non-existent property for us.

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