Reliably trapping end of paragraph / return to vertical mode
William F Hammond
hmwlfsr at yahoo.com
Wed Oct 2 22:12:25 CEST 2019
"Taylor, P" <P.Taylor at rhul.ac.uk> writes in part:
> ... Although Knuth provides \everypar, which can be
> reliably used to trap entry to a paragraph, there does not
> appear (to me, at least) to be any 100% reliable method of
> trapping exit therefrom, and of course once the next
> paragraph has been entered, the previous (and desired)
> value of \prevgraf has been lost. ...
I'm going to present what is going through my mind as a list
of questions. I am not in urgent need of answers for
1. Does \par begin or end a paragraph?
2. Does a blank line begin or end a paragraph?
3. Is there any difference at all between \par
and a blank line?
4. For the previous questions is there any difference
between plainTeX and LaTeX?
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