Re: Add tab-tie-follow-engraver (issue2723043)

[Marc Hohl]

Am 03.11.2010 20:33, schrieb Carl Sorensen:
> On 11/3/10 10:15 AM, "Marc Hohl"<address@hidden>  wrote:
>
>    
> > Am 03.11.2010 15:10, schrieb Carl Sorensen:
> >      
> > > On 11/3/10 6:50 AM, "Marc Hohl"<address@hidden>   wrote:
> > >
> > >
> > >        
> > > > Am 02.11.2010 04:04, schrieb address@hidden:
> > > >
> > > >          
> > > > > Updated to only acknowledge tab-note-head, not note-head.
> > > > >
> > > > >            
> > > > Makes perfect sense to me.
> > > > Thanks for your work!
> > > >
> > > >          
> > > You're welcome.
> > >
> > > Pushed to git.
> > >
> > >        
> > Oops, I found an error!
> >
> > While my engraver added 'tie-follow only to the notes followed by a slur
> > or a glissando,
> > your engraver adds this to *every* tied note, so the callbacks in
> > tablature.scm are
> > not working properly - *every* note that is 'tied to' gets parenthesized!
> >
> > Moreover, Neil's argument that slurs and glissandos do not belong to the
> > engraver
> > seems not to be valid - every note that is 'tied to' now gets the
> > 'tie-follow mark, so the
> > tie handler will make them invisible and the slur routine that may
> > follow changes the visibility
> > again, and that's exactly what Neil critiziced at my first approach (and
> > he was right about that).
> >      
> So perhaps what we need are 'tie-follow, 'slur-start, and 'gliss-start
> properties for a tab note head.
>    
No, I don't think we should it do more complicated that necessary.
Perhaps the name 'tie-follow is misleading, but the engraver (before you
left out the slur and glissando bits) did the right job - marking exactly
the tab-note-heads that have to be treated specially.

If we mark *every* tied-to note, we have to mark *every* start of a slur 
and *every* start
of a glissando as well and check for the appearance of (and ('tie-follow 
(or ( 'slur-start 'gliss-start)))),
which is overkill - just let the engraver take the decision, raise a 
flag, and the callbacks do their job.

Marc