\dontleavehmode
is
\dontleavehmode=\quitvmode.
and \quitvmode is a primitive
stricly speacking we don't see a space, but a command that switch to a
mode to another.
And it's also sound good: you have put a command to change status.
\hskip\zeropoint\hbox{} ;-)
here we see a space of 0pt.
Can be a bit embarassing that "a horiz. space of 0pt" make difference
between status,
because one can think "hey, a space of 0pt is nothing and should do nothing!"
(Of course, \hskip0t has sense )
\hskip1sp\hbox{...}
here we see a space of 1sp, ie (1/2^16) * 1pt which is invisible to human eye.
Here my "invisible touch" effect.
It's more "human" because i can say "hey, you have inserted a hor.
space very small, so small that you can see it,
but it's always a hor,. space not null, so it's reasonable a change of state."
btw,
the context way is
\dontleavehmode
--
luigi
...
it's new .
it's powerful .
it's luatex .
http://www.luatex.org
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