bug#69346: 13.2; newcommand arguments affecting indentation

[Paul Nelson]

It occurred to me that a better solution would be to constrain the
"if*" commands matched by the regexp produced by
LaTeX-indent-commands-regexp-make.  My earlier patch fixed the
preamble definition, which was all that mattered for the specific tex
file that I was editing, but it is more natural to simultaneously fix
any uses of such commands.  I've attached a patch which gives my best
attempt at doing this (no claim of optimality).

0001-fix-indentation-issue-involving-user-defined-if-comm.patch
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