When a lyric syllable corresponds to several notes, it is easy to get a line extending under all the notes concerned. When a lyric syllable corresponds to a single full note (or dotted full or a half note) I would like to see a line the extends from the lyric till the completion of the current note. Here is an example:
%%%%%%%%%
\version "2.18.2"
<<
\new Voice = melody {
\relative c' {c4 d e f g1}}
\new Lyrics \lyricsto melody { cee dee eee ef gee}
>>
%%%%%%%%%
This is what it produces:
This is what I would like to see with a line showing that the lyric gee extends to the end of the measure: