How line numbers can be off in js debugger.

A user filed issue 246 with Firebug including an example that explains 
at least some of the problems I have had with line numbers from JSD.

Script tags like:
  <script language="javascript"
                 type="text/javascript"
                 src="foo.js"></script>
		<script language="javascript"
                 type="text/javascript"
                 src="bar.js"></script>
cause the line numbers from JSD to be off by 4 lines.
I guess (6 - 2) = 4, 6 original lines and 2 compressed lines.
If I use 12 lines in 4 script inclusions I get 8 line offset:
(12-4)= 8.

But I can't figure out the direction: JSD gets larger line numbers, not 
smaller as I would guess.  Also a workaround will need some work...

Affects both Venkman and Firebug.

Test case:

http://fireclipse.svn.sourceforge.net/viewvc/*checkout*/fireclipse/trunk/FireclipseTests/WebContent/issue246badForDebugging.html

John.