[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4937 [GSoC] Implement cross-voice dynamic spanners

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[issues:#4937] [GSoC] Implement cross-voice dynamic spanners

Status: Started
Created: Wed Jul 20, 2016 12:56 AM UTC by Nathan Chou
Last Updated: Wed Jul 20, 2016 12:56 AM UTC
Owner: nobody

[GSoC] Implement cross-voice dynamic spanners

\= was changed to allow setting spanner-share-context property on
events. spanner-id was consequently changed to a key.

Spanner_engraver class modifies a new context property sharedSpanners.
Spanner information, including the Spanner object and the current
voice the spanner belongs to, is stored in this property. If a context
above Voice is used, other voices may see the spanner and modify it.

Dynamic_engraver and Dynamic_align_engraver were changed to support
cross-voice spanners using the above mechanics. I rewrote portions of
Dynamic_align_engraver to do this more easily.

Examples:
<< { c\=Score.hello\< d e f } \ { e f g\=Score.hello! a } >>
\new Staff { << { c d e\=Staff.hello\< f } >> << { g> f!\=Staff.hello! e d } >> }
\new Staff { c d e\=1\< f\=2\< g f\=1! e\=2! d }

http://codereview.appspot.com/304160043

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