[Bug 303269]

[Bzbarsky]

We don't have an existing notification system that would work for that.
We'd need to add something.

That said, you only care about this for things that have frames, no?  Is
there a reason that GetStyleVisibility()->mLanguage (which is somewhat
different, in that I think it ignores Content-Language but does look at
charset and ignores xml:lang, but we could fix those differences if we
needed to) won't work for you?  That has automatic change notifications
built in, sorta.

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https://bugs.launchpad.net/bugs/303269

Title:
  Automatically select language for spell check based on user input

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