#1276 MetronomeMark 'break-align-symbols should work with all objects

[Anonymous]

Originally created by: *anonymous

Originally created by: v.villenave

% New report by Xavier:

% MetronomeMark #'break-align-symbols seems to fail with
% everything (clef, left-edge, staff-bar, ...) except
% key-signature and time-signature.

\version "2.13.31"

\score {
\new Staff {
   \tempo "MetronomeMark #'break-align-symbols"
   \repeat unfold 8 c'1 \break
   \override Score.MetronomeMark #'break-align-symbols = #'(clef)
   \tempo "Clef does not work"
   \repeat unfold 8 c'1 \break
   \key g \major
   \override Score.MetronomeMark #'break-align-symbols = #'(key-signature)
   \tempo "KeySignature works (as well as TimeSignature)"
   \repeat unfold 8 c'1 \break
   \override Score.MetronomeMark #'break-align-symbols = #'(left-edge)
   \tempo "Left-edge does not work"
   \repeat unfold 8 c'1 \break
   \override Score.MetronomeMark #'break-align-symbols = #'(staff-bar)
   \tempo "Staff-bar does not work"
   \repeat unfold 8 c'1 \break
}
}

%%%

See also issue 684.

Kieren has offered an extra bounty for this one.

Neil: "this is partly due to the way I fixed the bad alignment
when key signatures are present (using Item::break_visible).  I'm not
sure what we can do about it though; while it's clearly a dubious hack
to be checking break-visibility in the engraver (for Clef, it seems to
be too early), there doesn't seem to be a sane alternative unless we
defer the choice of alignment until later."
http://lists.gnu.org/archive/html/lilypond-devel/2010-09/msg00335.html

[Google Importer]

Originally posted by: n.putt...@gmail.com

One further note:  '(staff-bar) doesn't work since it's reserved in the engraver for full-bar rests; any acknowledged barline is already found before 'break-align-symbols is checked.

[Google Importer]

Originally posted by: x.sche...@gmail.com

Maybe the following information could be relevant (hence this comment
attached to this issue on the tracker).

In the previous report I said MetronomeMark #'break-align-symbols did
align well on key-signature.  This is not true.
Apparently it worked only because the key signature was changed
_at the same time_ as the tempo mark.  If the key signature is set
before, MetronomeMark does not align on key-signature at a line break.

\score {
  \new Staff {
    \key e \major
    \repeat unfold 8 c'1 \break
    \override Score.MetronomeMark #'break-align-symbols = #'(key-signature)
    \tempo "KeySignature does NOT works either"
    \repeat unfold 8 c'1
  }
}

So it appears MetronomeMark #'break-align-symbols fails with *every
object* except time-signature.

I don't know if somebody has to update the initial report on the tracker
or if this comment is sufficient.

Cheers,
Xavier