bug#19301: Style file for mathtools bug

[Andrew Francis Swann]

mathtools.el of 2011-02-13 has small typo in TeX-add-style-hook.  There we
have

(setq LaTeX-label-alist
         (append '(("lgathered"    . LaTeX-amsmath-label)
                   ("rgathered"   . LaTeX-amsmath-label)
                   ("multlined"    . LaTeX-amsmath-label)
                   LaTeX-label-alist))))

which has the last LaTeX-label-alist included in the quote.  It ought to be

(setq LaTeX-label-alist
         (append '(("lgathered"    . LaTeX-amsmath-label)
                   ("rgathered"   . LaTeX-amsmath-label)
                   ("multlined"    . LaTeX-amsmath-label))
                   LaTeX-label-alist)))


with one closing bracket moved from the last to the penultimate line.

One symptom of the miscoding is that addition of labels does not work as
expected.

Andrew Swann

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