Re: pause.sty and vertical spacing

On Tue, Oct 28, 2003 at 01:28:23PM +0000, Marc van Dongen wrote:
> Klaus Guntermann (guntermann=jNDFPZUTrfRmTlJ5tp4iNa5Fl2EJEGXphC4ANOJQIlc@public.gmane.org) wrote:
> 
> : Indeed that would be nice. But I do not have an idea how to achieve
> : that. 
> : The problem is that \pause inserts something into the resulting pdf/dvi
> : output stream to control the post processor. Thus there is some care
> : needed to place the uses properly, because TeX may insert glue before
> : or after the almost invisible \pause, if you do not take care.
> : Because of this the manual suggests to put the \pause close to printed
> : material.
> 
> In my experience vertical layout only screws up between paragraphs.
> Most of the time it helps to put the pause at the end of the paragraph
> after which you want a pause. Make sure to put it immediately after
> something that is printable.
> 
> If you put the pause at the start of a paragraph before which you want a pause
> then in my experience the vertical layout frequently (if not always) screws up

I am looking at a solution where I do something akin to \removelastskip
I will test it somewhat and come back here.
 \gdef\[email protected][#1]{!
      \ifvmode
      \dim0=\lastskip\vskip-\dim0
      \vbox to 0pt{\vss\hsize0pt\noindent\hbox to
      0pt{\pppp=O96M0/[email protected]{#1}}}!
      \vskip\dim0
      \else!hmode or mmode
       \null\hbox to 0pt{\pppp=O96M0/[email protected]{#1}}\null!
         !\null\hbox to 0pt{\pppp=O96M0/[email protected]{#1}}\null
         \fi}

However, I lose the spring quantity by doing this. Is there a TeX
primitive that would get me the \lastspring?