\magnifyMusic bug

[Павел Буданов]

\magnifyMusic does not affect to new voices (see the example below). If it
is a normal behavior then why \magnifyMusic requires curly braces? It would
be more logical to do this as \voiceOne etc. commands (without curly
braces).

\version "2.20.0"
\relative c' {
   \magnifyMusic 0.5 { c d e f \new Voice { g a b c } }
   \magnifyMusic 0.5 << { e, f g a } \\ { c, d e f } >>
}