musescore/MuseScore — pull request #112 by mgavioli (2012-10-19 19:22:37+00:00)
Title: Tied notes to cross-measure values

Visually combines pairs of notes across a bar line in a single cumulative note value.

Used in early music, usually together with mensurstrich.

For discussion and samples see: http://musescore.org/en/node/18577