How to modify a syllable, if "~" (or "_") is involved?

[Thomas Morley]

Hi,

is there any possibility to modify one syllable of LyricText if the
syllables are connected with "~"?

In this example the \markup disturbs "~".
(Same for "_")

\version "2.17.26"

\new Lyrics \lyricmode {
    foo~bar
    \markup { \italic foo }~bar
}

Thoughts?


Thanks,
  Harm