[texhax] \mark causing a blank line

Donald Arseneau asnd at triumf.ca
Mon Jun 22 01:22:14 CEST 2015

On Sat, June 20, 2015 3:45 pm, Stan wrote:

> This sentence's length and the use of a mark create an unexpected blank
> line below for some reason..... \mark{mark}
>
> Removing one period after reason'', or the space before the mark, makes
> the blank line disappear. (I'm not saying that putting a space there makes
> sense.) Does anyone know why this happens? My only guess is that the mark
> prevents the space before it from being removed when TeX breaks the text
> into lines. I'm not sure if this is a bug, but it seems odd, at least.

Not at all odd.  There is a line-break before the \mark and the
\mark appears on a line by itself.  The same would happen for \hbox{}
or \vadjust{}.  (In fact, \mark works quite a bit like \vadjust in that
it migrates to the vertical list.)

Donald Arseneau, TRIUMF CMMS, asnd at triumf.ca