Koma-Script areaset and footlines

Question

It seems like that the options footlines and footheight are ignored if areaset is used. Consider the following MWE

\documentclass[footheight=30pt]{scrlttr2}

\usepackage{scrlayer-scrpage}

\pagestyle{scrheadings}
\clearscrheadings
\cfoot{foo \\ bar}

\areaset{17cm}{25cm}

\begin{document}
Hello
\end{document}

Although footheight=30pt is set I get the following warning if compiled:

Package scrlayer-scrpage Warning: \footheight to low.
(scrlayer-scrpage)                At least 28.99998pt needed,
(scrlayer-scrpage)                but only 18.125pt found.
(scrlayer-scrpage)                I'll enlarge \footheight, for further
(scrlayer-scrpage)                processing, but you should do this yourself,
(scrlayer-scrpage)                e.g., setting typearea's option
(scrlayer-scrpage)                `footheight=28.99998pt'.
(scrlayer-scrpage)                I'll also increase \footskip on input line 13

The problem still persists if footlines=2.1 is used. Any ideas what is going wrong here?

Answer 1

By default \areaset ignores options headheight, headlines, footheight and footlines. This is documented in the KOMA-Script manual scrguien.pdf (English) and scrguide.pdf (German). And in Part II of the KOMA-Script manual you can find option areasetadvanced, that changes the behaviour. Nevertheless there are still some difference in details of the margin calculation used by \typearea and \areaset. Have a look at the manual for more information.

\documentclass[footheight=30pt,areasetadvanced]{scrlttr2}

\usepackage{scrlayer-scrpage}

\pagestyle{scrheadings}
\clearscrheadings
\cfoot{foo \\ bar}

\areaset{17cm}{25cm}

\begin{document}
Hello
\end{document}