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Clef: Use `extra-space` for distances to time and key signatures

Werner Lemberg requested to merge dev/wl/clef into master

  • Avoid horizontally oversized regression tests

    This improves viewing of test-results/index.html.

  • changes.tely: Avoid overlong line

  • Clef: Use extra-space for distances to time and key signatures

    Despite of being only three modified lines, this is a huge change, affecting a lot of scores.

    Here is a table of old and new widths as reported by ly:paper-column::print (at 20pt staff size).

    clef + time sig old new difference comment
    treble 7.70 7.55 -1.6%
    bass 7.70 7.66 0%
    alto 7.70 7.70 +0.5%
    GG 7.70 9.05 +17.9% was far too narrow
    varC 7.70 7.23 -5.6%
    petrucci-c3 7.70 5.98 -21.8% was far too wide

    The results for 'clef + key sig' are very similar.

    Note that, as before, the widest clef in a staff group determines the horizontal position of all clefs in a system; this means, for example, that a piano score containing a treble and a bass clef doesn't change at all.

    Fixes issue #3598 (closed).

Edited by Werner Lemberg

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