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Re: \center-column broken

From: Aaron Hill
Subject: Re: \center-column broken
Date: Sun, 14 Feb 2021 07:36:11 -0800
User-agent: Roundcube Webmail/1.4.9

On 2021-02-14 7:08 am, Johannes Feulner wrote:
Hi there,

\center-column is broken. In 2.18 it was still OK. The lines of a
\center-column are supposed to be centered under each other. This is
at least with 2.23.1 not any longer the case. Please, see attached
pictures. The "aaaa" is clearly not centered unter the "|".

   \version "2.18.0"

   { a'1 a'1
      c'' ^\markup
     \center-align \box \bold \fontsize #10 \center-column { "|" "aaaa"
   "bbb" "|" }

For reference, I see the correct behavior with 2.22.0 and 2.23.0, testing with both PDF and cropped PNG output. (Latest on lilypond.org is 2.23.0-1, so are you compiling something yourself?)

Ultimately, this is a bug with how the glyphs are being rendered, not one related to centering. Specifically, the wrong font is being rendered compared to the one that determined the physical extent. If the narrower-looking letters had been intended, \box would have been much tighter around the markup. This looks like an issue you would get with poor font substitution, so are you able to rule out issues with your PDF viewer and environment?

Another problem is with \center-align. \center-align centers its
contents (here the box) over the left edge of the note it is attached
to. This does not look very centered at all. It should be centered
over the middle of the note's x-extent. This was already wrong in

You need to adjust parent-alignment-X as desired:

\version "2.22.0"

{ a'1 a'1
  c'' -\tweak parent-alignment-X #CENTER
      ^\markup \center-align \box \bold \fontsize #10
               \center-column { "|" "aaaa" "bbb" "|" } }

-- Aaron Hill

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