strange pygments handling of LilyPond input

[Werner LEMBERG]

Please have a look at the attached image; it's taken from the LM,
chapter 3.1.4.  As can be seen, `_` and `-` are bold, and `^` isn't.
Is it possible to make `_` and `-` bold only if used as articulation
(i.e., *after* `[_^-]`)?


    Werner