Strange output for Glissando.to-barline

[Thomas Morley]

Hi,

'to-barline does not work as expected for Glissandi.

\version "2.19.81"

{
  \once \override Glissando.to-barline = ##t
  f'1\glissando
  c'1
}

Same problem for all tested versions, i.e. 2.12.3 up to 2.21.0

I have only a vague guess how 'to-barline is done in the relevant
.cc-files, though I've got the impression there is some work done to
care about spanner-extent in x-axis direction, but I couldn't identify
anything about y-axis wrt 'to-barline in staff-symbol.cc and
note-spacing.cc.

Also, we have no regtest for Glissando.to-barline, it's mostly about
Hairpins. One with TrillSpanner and another for the SchemeTextSpanner.

Cheers,
  Harm

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