* half of the fix for http://bugzilla.lyx.org/show_bug.cgi?id=4091

* half of the fix for http://bugzilla.lyx.org/show_bug.cgi?id=4091

  "Applying Text-style to math generates \color{ignore}"

Which kind of font changes do we want to support here? After all the
text style dialog is meant for text. So it only really make sense for
\mbox'es. But there we probably cannot store every font change because
it still math up to now.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@23681 a592a061-630c-0410-9148-cb99ea01b6c8