See screenshot from 041006 custom + JDK 1.5.0 of
usages of FileObject.isVirtual. Look at e.g.
JMManager.java's match:

if (fo.isVirtual() || !fo.isValid()) { // simply
ignore virtual and invalid files return null; }

Where does the comment end and the real code resume?

Suggest one of:

1. Show only the actual line of text, not the
whole block. Would also solve the problem of the
absurdly long horizontal scrolling here.

2. Trim all line or block comments before
displaying. Might make it harder to see what
something is doing, however.

3. Show comments, but in a different face, e.g. in
grey, so they cannot be confused with code.