[tex-live] Possibility to enhance registers

Zdenek Wagner zdenek.wagner at gmail.com
Mon Sep 24 20:36:06 CEST 2012

2012/9/24 Robin Fairbairns <Robin.Fairbairns at cl.cam.ac.uk>:
> bernhard <bernhard.kleine at gmx.net> wrote:
>> > No, it has nothing to do with configuration. The reason is that you
>> > try to remove penalty in the vertical mode but the main vertical list
>> > is empty (see The TeXbook for explanation). This is an error in a
>> > definition of some macro.
>> And can you please explain why this occurs only at the 8th occurence of
>> that code and not at the 1st,2nd...7th, 9th, ...14th. The code is for
>> sure the same at any of its 14 places!
> position on page, perhaps?  we're operating in the dark, here: you're
> letting out snippets of information, none of which is likely to be
> diagnostic, so far.
It may be even more complex because page breaking is an asynchronous
operation. In the simplest case of a page containing text only the
paragraph is broken to lines and the lines are inserted to the main
vertical list. If the main vertical list is higher that the page
height, the page is completed and sent to the output device. The rest
is returned back to the main vertical list. It may happen that
everything fits on the page so that after the page break the main
vertical list will be empty. The result is that just by looking at the
file it is very difficult to predict whether the main vertical list
will be empty or not.

> r

Zdeněk Wagner

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