[view] Fix horizontally stretchable operators.
[view] Fix horizontally stretchable operators.

gjtorikian/lasem,wavewave/lasem,gjtorikian/lasem,janmarthedal/mathml2svg,gjtorikian/lasem,janmarthedal/mathml2svg,wavewave/lasem,wavewave/lasem,janmarthedal/mathml2svg,gjtorikian/lasem,wavewave/lasem,janmarthedal/mathml2svg