`general.useragent.locale` is no more. All hail `intl.locale.requested`

Mike Hommey mh at glandium.org
Tue Dec 5 23:47:59 UTC 2017

On Tue, Dec 05, 2017 at 03:15:06PM -0800, Zibi Braniecki (Gandalf) wrote:
> Hi all,
> We just landed a major patch which replaces `general.useragent.locale` pref
> with a new pref `intl.locale.requested`.
> Historically, `general.useragent.locale` has been widely used to set a
> locale for Firefox UI.
> This year, we introduced a full new API called mozilla::intl::LocaleService
> which allows for setting and reading via setRequestedLocales and
> getRequestedLocales, respectively.
> Behind some linting and checking, the API still used
> `general.useragent.locale` which limited us due to the nature of the pref
> and how it stored data.
> With the change, we introduce a new pref - `intl.locale.requested`, which
> can be set in the same manner if needed, but can also handle a list of
> locales separated via `,` character and is validated to accept only
> well-formed BCP47 language tags [1] making our locale handling much more
> flexible and resilient.
> This is one of the last major changes in the grand rewrite of how Gecko
> handles locales and language negotiation.
> If you need to read/write the requested locales it is *highly* preferred
> that you use the (mozI)LocaleService API over reading/writing to the pref
> itself, but if you must, the code will be able to handle your change with
> grace.
> Over last months we removed all direct writes/reads of the pref, so I hope
> there is nothing remaining, and we also introduced a migration code in
> nsBrowserGlue for 59 users, but if you happen to encounter a regression,
> please report it and CC me.
> If you have any questions about it, let me know!

Any change wrt intl.locale.matchOS?


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