Text styles on lyrics: add background colors on the whole line
As an engraver, I want to add background colors on the whole even/odd lines of lyrics (or on any specific lines).
So when we have more than 5 verses in a song, spread on different systems, it is still easy to read without make mistakes.
Other use cases: this will allow to highlight specific verses, like intro/outro, or doxology in christian musics.
Currently, it's only possible to add background colors on words, not the whole line.