\metroset does not work with \useoutertheme

[sgargbugreporter]

Section 6.2 (pg 12) of the manual says that if one needs to use different colors, the suggested method is to use:

\useoutertheme{metropolis}
\useinnertheme{metropolis}
\usefonttheme{metropolis}
\usecolortheme{seahorse}

instead of:

\usetheme{metropolis}
\usecolortheme{seahorse}

However, when i try to do the same and try to compile the file [demo.tex] (https://github.com/matze/mtheme/blob/master/demo/demo.tex) in the package I get:

! Undefined control sequence.
l.74     \metroset
                  {titleformat frame=smallcaps}

This error does not occur with \usetheme{metropolis}

How to fix this?

[sgargbugreporter]

Moving the declarations to the preamble as suggested by @rchurchley in #235 fixes this.

I think that the demo.tex needs to be updated and a mention made of this - put all theme & colour declarations in the preamble.

[matze]

Moving them out is not an option for the demo because the very point of it is to show the different titling formats we can offer. In my opinion, clarification in the manual should be enough. Better yet, we should figure out why there is this difference in the first place.

[benjamin-weiss]

Better yet, we should figure out why there is this difference in the first place.

Because \metroset is defined in beamerthememetropolis.sty. We should probably add \providecommand{\metroset}{...} to the inner, outer, color and font themes.