mathtext kerning around comma

[anntzer]

When using a comma as thousands separator in tex, one should wrap it in braces to avoid a spurious space after it (http://www.tex.ac.uk/FAQ-dec_comma.html). See below the difference between "$1{,}234{,}567" and "1,234,567$" with text.usetext=True.

Unfortunately, mathtext doesn't implement this detail (text.usetex=False).

(It doesn't look that bad on these zoomed images but I think the difference is more visible if you draw them e.g. using xlabel.)

(Yes, this qualifies as a major nitpick.)

[mdboom]

I agree it should be fixed. Adding the {,} where using comma as a thousands separator seems to be the easy part. Making mathtext obey the braces may or may not be a large project.

Cc: @zblz due to his recent interest in mathtext.

[anntzer]

"easy" modulo localization :/ (a quick look suggests there's "," -> "{,}", "." -> "{.}" and " " -> ",")

[zblz]

@anntzer, @mdboom: I gave it a shot in #5813. It is a quick fix, and spaces inside the brackets will still cause it to typeset a space after.