[webkit-changes] [WebKit/WebKit] 15862a: REGRESSION (268779 at main): Style sheets fail to loa...

[Wenson Hsieh]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 15862a58a171e73ee12f97feb0fbe4d262b5202b
      https://github.com/WebKit/WebKit/commit/15862a58a171e73ee12f97feb0fbe4d262b5202b
  Author: Wenson Hsieh <wenson_hsieh at apple.com>
  Date:   2023-12-20 (Wed, 20 Dec 2023)

  Changed paths:
    M Source/WTF/wtf/cocoa/RuntimeApplicationChecksCocoa.h
    M Source/WebCore/loader/cache/CachedCSSStyleSheet.cpp

  Log Message:
  -----------
  REGRESSION (268779 at main): Style sheets fail to load in the 交通银行 app on iOS
https://bugs.webkit.org/show_bug.cgi?id=266716
rdar://118649749

Reviewed by Chris Dumez.

Add a new linked-on-or-after check to guard the (spec-compliant) behavior change in 268779 at main. In
particular, the response status code for the stylesheets loaded in this app are 0, due to the
returned `NSURLResponse` in `WKNetworkSessionDelegate` not being a subclass of `NSHTTPURLResponse`.

* Source/WTF/wtf/cocoa/RuntimeApplicationChecksCocoa.h:
* Source/WebCore/loader/cache/CachedCSSStyleSheet.cpp:
(WebCore::CachedCSSStyleSheet::canUseSheet const):

Canonical link: https://commits.webkit.org/272379@main