Ambitus_engraver causes ghost laissezVibrer ties on first note of Voice

[Jeff Olson]

Do you like ghosts?

Putting an LV tie on the first note of a Voice in which there is an 
ambitus generates two unwelcome "ghost" LV ties floating unattached 
above and below the note, in addition to the desired single LV tie that 
is properly attached to the note.  Here is the MWE (see also attached 
image Ambitus-LV-ghosts.png):

\version "2.22.0"
\new Voice \with { \consists "Ambitus_engraver" } {
  a'\laissezVibrer c'' c'
}

In this example, the c'' and c' are necessary to establish a range for 
the ambitus to display that is distinct from the note with the proper LV 
tie.  By experimenting with these notes (or simply by visual inspection 
of the output) you see that the two floating ghost LV ties are at 
vertical positions within the first note column that match the two 
extrema of the ambitus.  They are the same LV ties that would be 
properly expected had the ambitus extrema been included as notes in a 
chard with the first note, like this:

<a' c'' c'>\laissezVibrer

So the vertical position of the ghosts is determined by the ambitus even 
though their horizontal position is in the first note column.

This behavior exists at least in 2.22.1 and 2.18.2.  Log files are clean.

The ghosts disappear when the LV tie is not on the first note (e.g. just 
add initial g'):

\new Voice \with { \consists "Ambitus_engraver" } {
  g' a'\laissezVibrer c'' c'
}

The ghosts also disappear if the ambitus belongs to the Staff context 
(just change Voice to Staff):

\new Staff \with { \consists "Ambitus_engraver" } {
  a'\laissezVibrer c'' c'
}

I don't like ghosts.  Please fix.

Jeff

Ambitus-LV-ghosts.png
Description: PNG image