texmath-0.13.3.4: test/writer/starmath/066_standalone_plus_minus_scripts_get_neutral_operands.test
<<< tex
r_{r,e}=r_{r,e}^{+}-r_{r,e}^{-}
>>> starmath
r_{r, e} = r_{r, e}^{{}+{}} - r_{r, e}^{{}-{}}
<<< tex
r_{r,e}=r_{r,e}^{+}-r_{r,e}^{-}
>>> starmath
r_{r, e} = r_{r, e}^{{}+{}} - r_{r, e}^{{}-{}}