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An auxiliary grob to group
several breakable items of the same type (clefs, time signatures,
etc.) across staves so that they will be aligned horizontally.
BreakAlignGroup objects are created by:
List of axis numbers. In the case of alignment grobs, this should contain only one number.
Grobs aligned to this breakable item will have their X-offsets shifted by this number. In bar lines, for example, this is used to position grobs relative to the (visual) center of the bar line.
ly:break-aligned-interface::calc-extent-aligned-anchorfor aligning an anchor to a grob’s extent.
A vector of 3 booleans,
#(end-of-line unbroken begin-of-line).
X-extent(pair of numbers):
Extent (size) in the X direction, measured in staff-space units, relative to object’s reference point.
This object is of class Item (characterized by