[texhax] \nobreaks shrinks following text (was: \nobreak adds undesired vertical glue)

[Rodolfo Medina]

Rodolfo Medina <rodolfo.medina at gmail.com> writes:

> At a certain point of a text, I need inserting a `\nobreak' to prevent page
> breaking.  But then some undesired vertical glue is added by plain TeX.  Is
> it possible to avoid that, and how?


I correct myself: it's not that \nobreaks adds extra vertical glue, but that it
shrinks the text that follows in the current paragraph.  Can anybody explain
why?

Thanks for any help
Rodolfo