Bug#582421: [Patch] Floating point is broken if :lang is called in gvim

[Bram Moolenaar]

James -

> If the locale is changed in gvim via ":lang" to a locale which uses
> comma for the decimal separator, then floating point numbers are no
> longer usable.  This only happens with the ":lang $locale" variant,
> since that sets $LANG before calling gtk_set_locale().
> 
>   env LANG=C gvim
>   :lang es_ES.UTF-8
>   :lang messages C  " so errors are in English
>   :echo ceil(1.2)
>   E806: using Float as a String
>   E116: Invalid arguments for function ceil(1.2)
>   E15: Invalid expression: ceil(1.2)
>   :echo str2float('1.2')
>   1,0
>   :echo str2float('1,2')
>   1,2
> 
> Attached patch fixes the issue by ensuring $LC_NUMERIC is set to C if
> the LC_ALL version of :lang is called.

Thanks.  In other places we do this:

    setlocale(LC_NUMERIC, "C");

Thus I think we should do the same in this place.

- Bram

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