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

[Jean-Marc Lasgouttes]

Le 18/10/2023 à 16:38, Scott Kostyshak a écrit :
> 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>.

This is indeed the kind of thing I was trying to fix indeed.

JMarc