[LyX/master] Assure correct spacing of colored items in mathed

[Scott Kostyshak]

On Sun, Aug 02, 2020 at 06:38:06PM +0200, Enrico Forestieri wrote:
> commit 7441172d4d9a26eb4824bb8bee003f457ef34f1c
> Author: Enrico Forestieri <forenr at lyx.org>
> Date:   Sun Aug 2 18:58:40 2020 +0200
> 
>     Assure correct spacing of colored items in mathed
>     
>     When coloring a non-ordinary math atom, explicitly apply its
>     math class, so that to leave unchanged the spacing around it.
>     Fixes #11827.
> ---

I see an assertion on master that I think started happening with this commit.

Here's the assertion:
ASSERTION false VIOLATED IN /home/scott/lyxbuilds/master/repo/src/mathed/MathClass.cpp:59

The assertion happens when I just open the attached file.

Can you reproduce?

Scott
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