1632302 - mozilla::intl::Locale fails to parse a lang tag that includes extension subtags

Status: NEW

(Core :: Internationalization, defect, P3)

Description

[Jonathan Kew [:jfkthame]]

This led to incorrect font prefs usage in bug 1618034, because Google Translate serves pages with tags like lang=en-x-mtfrom-it; the presence of the private extension subtag caused Locale() construction to fail, and resulted in using x-unicode font prefs instead of x-western.

(When this is fixed properly, we should remove the hack introduced by bug 1618034 to strip -x- subtags in nsLanguageAtomService::GetUncachedLanguageGroup.)

Comment 1

[Zibi Braniecki [:zbraniecki][:gandalf]]

We have two paths forward:

1. Use Locale from unic-locale to back MozLocale
2. Handle parsing locale identifier into LanguageIdentifier by stopping at the first -x-, -t- or -u- and ignoring the rest

I think I'd prefer to start with (2), and extend to (1) if we need to support extensions in Gecko.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:m_kato, could you have a look please?

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