Comment #5 on issue 3568 by [email protected]: bendAfter affected by bar
numbers
http://code.google.com/p/lilypond/issues/detail?id=3568
Bar numbers have an outside-staff-priority and are moved to the extremal
staff and have empty extra spacing width, so they won't effect note spacing.
The issue is connected to the box/skyline dichotomy because the right bound
of the spanner is the current column (see bend-engraver.cc). The current
column is a NonMusicalPaperColumn, which is as fat as its fatest member,
which is the bar number. The spanner uses the full extent of the box
around the NonMusicalPaperColumn to fix its bound (see line 912 of
output-lib.scm). If, however, the spanner had some sort of horizontal
skyline and measured this against the NonMusicalPaperColumn's horizontal
skyline, it wouldn't collide.
A much simpler solution would be to make a scheme version of
Axis_group_interface::generic_bound_extent that could be accessed from
bend::print. This is the function that several spanners
(pedal-piano-bracket, line-spanner, hairpin) use to get the extents of
bounding items and that's how they avoid this problem. This solution made
sense when one could use only the extents of bounds, but it could be done
away with now that better skylines exist (assuming that this wouldn't cause
a performance hit).
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