Pango question about font

[Igor Korot <ikorot01 gmail com>]

Hi, ALL,
Hopefully there is a person who is familiar with Pango...

The documentation for PangoUnderline -> PANGO_UNDERLINE_ERROR states:

[quote]
a wavy underline should be drawn below. This underline is typically
used to indicate an error such as a possilble mispelling; in some
cases a contrasting color may automatically be used. This type of
underlining is available since Pango 1.4.
[/quote]

2 questions:
1. "in some cases a contrasting color may automatically be used".
When? I.e. what are those cases?
2. Can I set the color used for the wavy underline? As an example on
Windows when there is a misspelled word the red color is used and when
there is a syntactical error - blue.

Thank you.