Underline probably gone wrong - does not work in Eclipse

[mdykierek]

I am using Monoid in Eclipse IDE.
Unfortunately error and spelling underlining does not work with Monoid.
Probable reason (actually confirmed by playing around) is Underline position being bigger by value than Descent.
It's height is also huge when compared to other fonts.
As a side note - a fraction bigger line spacing would improve readability of the text.