Spanner text in parenthesis on a new system

[Gilberto Agostinho]

Hi all,

Is it possible to automatically change the text of a spanner so that if they
last for more than one system they get parenthesized? I would like to apply
this both to the ottava indications as well as for the mixed style of
sustain pedalling (actually we don't show any text at all when Ped. lasts
for more than one system).

In the case of the ottava, the parenthesis in a new system are not required,
but some authors do use them. But in the case of the pedalling, it makes the
score much clearer in my opinion. See a faked version created on GIMP below:

<http://lilypond.1069038.n5.nabble.com/file/n184494/18.png> 

This is even more evident when there is a page turn in between the systems.

Would that be possible?



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