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max-slope-factor for tuplet brackets

Martín Rincón Botero requested to merge martinrinconbotero/lilypond:bracket_slope into master

This commit limits the slope that a tuplet bracket can have in some circumstances. The maximum slope of a tuplet bracket is so:

  1. Proportional to the slope of the beam, when the beam spans the whole duration of the tuplet (default Lilypond behavior).

  2. Proportional to the slope of the beam when the bracket is parallel to a beam that spans the whole duration of the tuplet (i.e. when the tuplet bracket is on the note head side) and the slope of the bracket is steep. In a sequence of discontinuous beams, the last beam is considered (as optical, directional guide).

  3. Otherwise, it is limited to the maximum slope calculated, which can be changed with the new property max-slope-factor.

Edit: thanks to Jean the new type predicate non-negative-number? has been added.

Closes #4928 (closed) Closes #992 (closed)

Edited by Martín Rincón Botero

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