Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: f1892e20fbb3e547cda226631b3cafe6bcc2e471
      
https://github.com/WebKit/WebKit/commit/f1892e20fbb3e547cda226631b3cafe6bcc2e471
  Author: Timothy Hatcher <[email protected]>
  Date:   2025-01-15 (Wed, 15 Jan 2025)

  Changed paths:
    M Source/WebKit/UIProcess/Extensions/WebExtension.cpp
    M Tools/TestWebKitAPI/Tests/WebKitCocoa/WKWebExtensionAPILocalization.mm

  Log Message:
  -----------
  REGRESSION: Web Extensions do not pick zh locale when zh-Hant is preferred.
https://webkit.org/b/286024
rdar://142602243

Reviewed by Brian Weinstein.

On Apple platforms, the best match search uses Foundation, which skips "zh" 
when the preferred locale is "zh-Hant",
likely assuming "zh" refers to simplified Chinese. However, web extensions 
expect the base language to be selected
if it is supported, regardless of specific variants.

Fix this by adding a special-case for base language fallback before using the 
default locale.

* Source/WebKit/UIProcess/Extensions/WebExtension.cpp:
(WebKit::WebExtension::bestMatchLocale): Added base language fallback.
* Tools/TestWebKitAPI/Tests/WebKitCocoa/WKWebExtensionAPILocalization.mm:
(TestWebKitAPI::TEST(WKWebExtensionAPILocalization, 
i18nChineseTraditionalFallback)): Added.
(TestWebKitAPI::TEST(WKWebExtensionAPILocalization, 
i18nChineseSimplifiedFallback)): Added.

Canonical link: https://commits.webkit.org/288974@main



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