Inconsistent line height with Cambodian Unicode

[Didi Kanjahn]

> I'm not top-posting

I am trying to place lyrics in a separate text block below the notes.

Cambodian (or Khmer) can have a number of diacritic type of glyphs below and
above the height of the normal characters. It appears that Lilypond calculates
for every line of Khmer text the maximum extent of the line and places lines
accordingly. As a consequence text in multiple columns is no longer lined up
horizontally after a few lines. I have not been able to make the baseline-skip
override work for me.

Any suggestions?

Version 2.13.3 is the only version known to me to handle Khmer Unicode
correctly, but it is clear that the problem is the same still in 2.13.23-1.