Re: Should we have a from-barline property in analogy to to-barline ?

[Simon Albrecht]

On 24.07.2017 13:58, David Kastrup wrote:
> Seems like an obvious addition.  Would make stuff (like slurs, hairpins
> and so on) starting at the bar move backwards to the bar line.  Probably
> also useful for non-spanners like a \fermata ?

I have difficulty imagining use cases. Is to-barline really used for 
anything else than hairpins? In hairpins there are just those two 
different conventions (or preferences, or use cases) where a 
(de)crescendo which musically ends on the first beat of the next bar may 
be drawn up to that beat or to the barline, but there is no analogy to 
that at the beginning of the bar. (Except that in manuscripts and 
hand-engravings hairpins often don’t align with notes or anything to any 
kind of precision, so there are probably enough examples for hairpins 
starting on barlines.)
I certainly can imagine that _attaching_ spanners, or fermatas, to 
barlines would be great. Which would not involve a from-barline 
property, but rather, … uhm, … making bar lines events? (always? only if 
necessary?) (Standard disclaimer: this is not a serious proposal due to 
my lack of knowledge on implementation)

Best, Simon