We don't want InsetCommand to have a function updateCommand while this is not a speci...

We don't want InsetCommand to have a function updateCommand while this is not a special function of an InsetCommand, but only accidentally a shared function of two children. So, in this case I think we should just (dynamically) cast these objecten and call their own insetCommand function.

This also fixes compilation again. I forgot to cherry-pick all commits in git ;)...

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@35845 a592a061-630c-0410-9148-cb99ea01b6c8