[LyX/master] Fixup 65cb9fa4: avoid extra spacing when selecting math

[Scott Kostyshak]

On Wed, Oct 18, 2023 at 11:10:31AM +0200, Jean-Marc Lasgouttes wrote:
> commit 99ecdd6cebaaaf6bf8e8123411475d26df9c358c
> Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
> Date:   Wed Oct 18 12:28:47 2023 +0200
> 
>     Fixup 65cb9fa4: avoid extra spacing when selecting math
>     
>     This was happening whenever a selection started/ended after a fraction
>     inset.
> ---

I think this commit fixed an issue that I was about to bisect. The issue
is fixed now, but since it seems the issue is tricky I thought I would
attach another case since it doesn't have to do with a fraction inset.
Perhaps that helps to narrow in on the issue.

To reproduce (before your fix), I would put the cursor before "=" and
hold shift and do <Right> and then <Left>.

Scott
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