What is doted?
The documentation references "doted" as default view command. What is that? Where can I find it?
Could this be it? It seems to be rather obscure...
http://web.mit.edu/spin_v4.2.5/share/graphviz/demo/
Maybe dotty is a better default for this, since it comes with the standard GraphViz installation. It is also documented on the GraphViz web site (see "Tool manual pages", https://graphviz.gitlab.io/documentation/)
It is of course easy to change the DOT view command, either through the customize interface or directly in your .emacs file:
(setq graphviz-dot-view-command "dotty %s")
dotty was deprecated years ago and last shipped with graphviz in 3.0.0.
Correct.
I prefer previewing inside emacs.
The new default viewer seems to be xdot.