On Fri, Oct 30, 2009 at 02:47:41AM +0100, Uwe Stöhr wrote:
> >> Note that the addition of mhchem was adding a new feature not a bug
> >> fix. I use \ce and mhchem successfully also with LyX 1.6.3.
> >
> > http://www.lyx.org/trac/ticket/6047
>
> This bug was a regression to LyX 1.5.x because of the new \ensuremath
> handling. The bug reporter said that it worked with LyX 1.5.6.
So, it was not a bug?
> The new feature is that we write
> \usepackage{mhchem}
> to the preamble as soon as the user uses the command \ce in a formula.
> So in LyX 1.6.3 yiou have to add this preamble line manually to the
> preamble line when you open LyX files from 1.6.4 that use \ce.
Ouch! Now I understand that it was a format change. I am really sorry
for having missed that.
> It is now as it is, but we should handle mhchem at least the same way
> as we handle esint and amsmath: The user can turn them explicitly off
> in the document settings under math. Do you agree?
No, I think that it is a different case. It is more probable that a
clash with a user defined macro occurs, rather than a clash among
packages. The clash with a user macro is cured by the patch I posted.
However, it is now clear that a format change should be introduced.
Now the damage is done in 1.6, but at least the problem should be
fixed in 2.0 when exporting to a previous format.
--
Enrico
