References: <20170607101428.GA17779@hzdr.de>
            <acfdbc42-9291-c724-ca65-c39da836f59e@morningstar2.co.uk>
            <1502234312.27138.49.camel@sipsolutions.net>
            <d2f013ff-3f09-e369-8cf6-19fa40baf4ec@morningstar2.co.uk>
Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-Pehn8AzT+hUnQN/EuZjJ"
Mime-Version: 1.0
Message-ID:  <1503265946.27303.13.camel@sipsolutions.net>
Date:         Sun, 20 Aug 2017 23:52:26 +0200
Reply-To:     Mailing list for the LaTeX3 project
              <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
Sender:       Mailing list for the LaTeX3 project <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
From:         Benjamin Berg <benjamin@SIPSOLUTIONS.NET>
Subject: Re: \hbox_set:Nn issue after expl3 [2017/05/13] update
To:           LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
In-Reply-To:  <d2f013ff-3f09-e369-8cf6-19fa40baf4ec@morningstar2.co.uk>
Precedence: list
Envelope-To: <rainer.schoepf@GMX.NET>
Status: R

--=-Pehn8AzT+hUnQN/EuZjJ
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hi,

On Wed, 2017-08-09 at 09:50 +0100, Joseph Wright wrote:
> On 09/08/2017 00:18, Benjamin Berg wrote:
> > just ran into the same issue myself. I haven't been able to solve my
> > usage yet but noticed in the processes that \vbox_set_top:Nw seems to
> > be still missing.
>=20
> Could you give a bit more detail of the case you need to solve?

I would expect it to be added either way, just so that the API is the
same for the different boxes :)

Anyway, the case I am trying to solve is a macro which in reality puts
the content into a box (this can be a vtop or hbox depending on the
command).

So my user would type something like:

  \question[text=3Dsome text]{\verb^some text^}

Here the "some text" is exported as metadata and the \verb should be
put into the box. I could implement the above command correctly using
\vbox_set_top:Nw by swallowing the opening braces and emitting
\vbox_set_end: using \group_insert_after: for the closing brace.
For now I have done a workaround using \vtop directly.

The reason to use \vtop is a bit more odd. I was unhappy that I
wouldn't get the correct interline skip for the first row of the vbox.
So my solution was to put it into a \vtop to measure the height and
then unpack it into a normal \vbox to get the correct \prevdepth value
after the box has been added to the vertical list.

Note that this works as I am calculating the interline skip myself.
There are a number of other (weird) things which make everything more
complicated, but I think this might explain enough.

I am happy to explain in more detail or point to the code.

Benjamin
--=-Pehn8AzT+hUnQN/EuZjJ
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: This is a digitally signed message part
Content-Transfer-Encoding: 7bit

-----BEGIN PGP SIGNATURE-----
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=YXCd
-----END PGP SIGNATURE-----

--=-Pehn8AzT+hUnQN/EuZjJ--