Re: Feature request: revert in another context

[Simon Albrecht]

On 28.11.2016 17:27, David Kastrup wrote:
> Simon Albrecht <address@hidden> writes:
>
> > \version "2.19.49"
> > %{
> > It would be formidable if in such a case one wouldn’t need
> > to look up the default stencil procedure, but could use either
> > \undo or \revert.
> > Is this a valid/sensible feature request?
> > %}
> > \score {
> >    \new PianoStaff \with {
> >      \omit SystemStartBrace
> >      \accepts GrandStaff
> >    } <<
> >      \new GrandStaff \with {
> >        % those don’t work
> >        %\undo\omit SystemStartBrace
> >        %\revert SystemStartBrace.stencil
> >        % this does
> >        \override SystemStartBrace.stencil =
> > #ly:system-start-delimiter::print
> >      } <<
> >        \new Staff { 1 }
> >        \new Staff { 1 }
> >      >>
> >      \new Staff { 1 }
> >    >>
> > }
> The context modification for GrandStaff does not have access to the
> unmodified definition of the enclosing PianoStaff (it doesn't even have
> access to the unmodified definition of GrandStaff and does not know that
> it will get applied to a GrandStaff) and even if it did, how should it
> guess that you want to undo PianoStaff settings rather than Score
> settings?

OK, I’ll take that as a no. Or is it just that it would be complicated 
to implement a behaviour matching my naïve expectation?

Best, Simon