[tex-live] Fix excessively wide math accents on scripted glyphs

[Khaled Hosny]

Hi all,

I think this have been reported several times before; with OpenType math
fonts accents over scripted glyphs are too wide as if the accent were to
be placed over the scripts as well. With a bit of investigation, it
turns out that with OpenType fonts, XeTeX is choosing the accent based
on the width of the box after adding the scripts to it unlike how it
does with legacy fonts, so unless there is really a good reason to do
that (I don't think so), it should check against the width of the box
before adding the scripts. The attached patch simplifies the code a tiny
bit to use the correct width, fixing this issue.

Regards,
 Khaled

P.S. \hat and \widehat are currently identical, but this is another
issue not related to this.
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