Re: Adds outside-staff-interface and outside-staff-axis-group-interface (issue 37950044)

[Mike Solomon]

On Dec 16, 2013, at 11:45 AM, address@hidden wrote:

> The summary seems incompatible with
> <URL:http://music.stackexchange.com/a/14160/8773>
> 
> Once an interface is required for outside-staffing a grob, the set of
> grobs one can use in that manner is hardwired to the "intended" grobs.

This is true.  The outside-staff-interface would need to be applied to every 
grob that could, in theory, be shifted this way.  I’d need help in flagging 
grobs I’ve missed - I’ve gotten everything that uses it in the regtests, but 
there are others that are not tested.  The stackexchange example is one of them.

I think the hardwiring is good in that we should avoid letting grobs implement 
interfaces with properties that could never, in any circumstance, apply to 
them.  Setting:

NoteSpacing.outside-staff-priority

makes my brain go NaN/0.  I the same way that setting:

NoteSpacing.bracket-flare

makes my brain go NaN/0.  The difference is that the second triggers a 
programming error whereas the first doesn’t.

As a corollary, if it doesn’t exist already, we may want to create a mechanism 
to add or subtract interfaces from grobs at runtime.

Cheers,
MS