David's pearls [was: [GSoC] Implement cross-voice dynamic spanners (issue 304160043 by address@hidden)]

[Alexander Kobel]

David,

while I did not read the entire mail, I just happened to stumble across 
this comment - made my day!

On 2016-10-21 15:22, address@hidden wrote:
> lily/include/engraver-group.hh:56: friend class Spanner_engraver;
>
> What is the friendship needed for in particular?  When it's not too much
> effort, it is nice to get along without friends, but if one does lean on
> them, it makes sense keeping book on what you need them for.
>
> This is not life advice.