Don't insert <mi/> on right-aligned columns. (mathjax/MathJax#3089) #996
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This PR fixes a problem with the
alignand similar environments where if a second set of aligned columns are used, then initial minus signs (and other operators) will be treated as infix rather than prefix operators. This is because the additional emptyminodes are being inserted for all columns but the first one. The fix proposed here is to not insert for right-justified columns (which will be the ones that start the second or later set of alignments). We can't use the column number itself, sincealignrepeats after two columns, whileeqnarrayrepeats after 3.Resolves issue mathjax/MathJax#3089.