[LyX/master] InsetMathFont: harden the new switches against unexpected values.

[Scott Kostyshak]

On Wed, Oct 30, 2024 at 12:59:14AM GMT, Thibaut Cuvelier wrote:
> commit 110e654b67cdc7399defa38b32810cf9e78ff95b
> Author: Thibaut Cuvelier <tcuvelier at lyx.org>
> Date:   Wed Oct 30 01:55:22 2024 +0100
> 
>     InsetMathFont: harden the new switches against unexpected values.
> ---

I now get the following:

/home/scott/lyxbuilds/master-master/repo/src/mathed/InsetMathFont.cpp:133:60: error: overlapping comparisons always evaluate to true [-Werror,-Wtautological-overlap-compare]
  133 |                 if (span_class.empty() && (family_ != MATH_NORMAL_FAMILY || family_ != MATH_DOUBLE_STRUCK_FAMILY)) {
      |                                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Scott
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