[LyX/master] Make all unbreakable spaces of the same Color_latex color

[Jürgen Spitzmüller]

Am Mittwoch, den 24.06.2020, 09:59 +0200 schrieb Jean-Marc Lasgouttes:
> A possibility for negative width (which probably will be seldom used 
> 
> anyway) would be to draw the sign upside down (|‾‾‾|. This is weird
> and not very informative, but negative spaces are weird too:)

I think it's hard to find something iconic. So using something symbolic
such as this is fine, as long as the two states are clearly
distinguishable.

We should use this consistently, then, i.e. also with hspace.

Jürgen
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