When bringing up the source window initially, the view with the source code does not scroll to the line that is currently being executed.
Log message: 2007-08-01 Mike Cvet <mcvet@redhat.com> * SourceWindow.java (updateShownStackFrame): Rely on function TextMarks for SourceBuffer scrolling, rather than line numbers. Fixes #4876. (populateStackBrowser): Ditto.