Re: Set indent based on instrument name (issue 6457049)

[Keith OHara]

On Sat, 04 Aug 2012 00:37:21 -0700, <address@hidden> wrote:

> On 2012/08/04 07:28:29, Keith wrote:
> > On 2012/08/01 06:45:22, MikeSol wrote:
>
> > > Avoid measuring extents when engraving is happening because they
> could be
> > > dependent on other callbacks which could trigger many layout
> decisions before
> > > engraving is finished.
> > >
>
> > This is a case where measuring extents early seems appropriate.
>
> I suppose this would spell the death knell to solving a somewhat
> different problem in the way linked to in comment 5 of issue 766
> <URL:http://code.google.com/p/lilypond/issues/detail?id=766#c5>.

I do not hear any death knell.
Nicolas' function makes the instrument name fill the space available, based on 
'indent'.  If the engraver evaluates the extents of instrument names with this 
function in place, the function can still look up 'indent' with no cycle of 
call-backs or any such problem.

After line breaking, when the actual stencils are formed for each line, 
Nicolas' function will be called again for each actual printing of an 
instrument name.  These calls will use the possibly-changed value of 'indent', 
but the same value for each staff.