Fwd: Non-arpeggio bracket extent

[sorry, adding lilypond-devel]

-------- Forwarded Message --------
Subject: Non-arpeggio bracket extent
Date: Sun, 19 Jan 2025 15:38:02 -0500
From: Dan Eble <[email protected]>
To: Werner LEMBERG <[email protected]>

The following example shows a table of \arpeggio styles and sizes.  The 
sizes are forced by the setting Arpeggio.positions property.

The bracket is not symmetric.  I think this is a bug and I would like to 
fix it, but I want to ask what the positions property is supposed to 
mean.  Is the positions property correct and the bracket wrong, or vice 
versa, or some of both?
-- 
Dan

```
\version "2.25.24"

testCase =
#(define-music-function (pos) (number?) #{
   \new Staff \with {
     instrumentName = #(number->string pos)
     \override Arpeggio.positions = #(cons (- pos) pos)
     \hide NoteHead
     \omit Clef
     \omit Stem
     \omit TimeSignature
   } {
     \cadenzaOn
     \arpeggioNormal b'4\arpeggio
     \arpeggioArrowUp b'4\arpeggio
     \arpeggioArrowDown b'4\arpeggio
     \arpeggioBracket b'4\arpeggio
     \arpeggioParenthesis b'4\arpeggio
     \arpeggioParenthesisDashed b'4\arpeggio
   }
   #} )

\testCase 0
\testCase 0.5
\testCase 1
\testCase 1.5
\testCase 2
\testCase 3
```