mathed editing() state

[Angus Leeming]

André,

if I edit a mathed inset and then leave it, a new preview is not generated 
because this is returning false:

bool InsetFormula::PreviewImpl::previewWanted() const
{
        return !parent().par_->asNestInset()->editing();
}

ie, the thing thinks its editing still. Have you changed anything recently 
that might cause this?

Angus