Feliz Navidad exposed two assignment faults. Each bracket was expanding
independently, so a lyric line between two systems could be claimed by
both, producing overlapping extents. And nearest-bracket is the wrong
rule: engravers space lyrics generously, so a line sits 43px under its
own system's bracket but only 10px above the next one's.
Now one pass assigns every run exactly once: ink overlapping a bracket
belongs to it, and otherwise the system above wins over the system
below. Text under a staff belongs to that staff.
Known limit, documented in _assign: where a lyric is printed tight
enough that no blank row separates it from the next system's staves,
the two fuse into one ink run and no row profile can split them. The
lyric goes to the system below and the cut lands ~90px high. Dragging
it is the fix.
Feliz Navidad now reads 5 systems on every page, staff 70px, with no
overlapping extents; Ketun joululaulu, Engel and Elaman nalka are
unchanged.
Esa Kataja
61dac44037