update/fix ligature algorithm

[grochat]

Take (and adapt) Medieval2.5 new ligature code (NoteSequence::buildGraphicsForLigature())

[tabourot]

New version of Catalogue_ligatures updated. Red ligatures are badly rendered Catalogue_ligatures202212.txt

[grochat]

[grochat]

Catalogue_ligatures.mei.txt

[tabourot]

In the enclosed example (real case), a vertical connector is missing for jumps of sixth interval. Incidentally (as already known) the beginning of the first ligature should not be oblique.

connexionLigatureSixte.xml.txt

[grochat]

That's Medieval 2.5 output. Any comment?

[tabourot]

For the vertical connectors, that's perfect. But the first segment of the first ligature shouldn't be oblique...

[tabourot]

Added last (josquin) version of Catalogue_ligatures, with indication of line width ("latitudo") Catalogue_ligatures202212.txt

[tabourot]

Great job ! Only two more small issues, it seems :

• The stem position for initial longae is blocked on the right.
• At the beginning of ligatures of more than two notes, verovio systematically displays an oblique, even when a recta is requested.

Cf. file enclosed : ligaturesResiduum230129.txt