[Issue 231] New - Some cvsgraph graphs are not viewable

http://viewvc.tigris.org/issues/show_bug.cgi?id=231
                 Issue #|231
                 Summary|Some cvsgraph graphs are not viewable
               Component|viewvc
                 Version|1.0-dev
                Platform|All
              OS/Version|All
                     URL|
                  Status|NEW
       Status whiteboard|
                Keywords|
              Resolution|
              Issue type|DEFECT
                Priority|P3
            Subcomponent|*unknown*
             Assigned to|issues@viewvc
             Reported by|bluethumb






------- Additional comments from bluethumb@xxxxxxxxxx Tue May  2 15:30:20 -0700 
2006 -------
I have a cvsgraph figure which cannot be viewed.  Others in the same repository
are OK.  Go to http://glast.stanford.edu/viewvc/TkrRecon/.  There are two files
in this list with cvsgraph icons.  Click .cvsignore to see a normal graph. 
Clicking ChangeLog produces a window with space for a long graphic, but the
image is not available.  I can examine the HTML source to find where the image
is supposed to come from.  Sending my browser there produces the error message
"The image
'http://glast.stanford.edu/cgi-bin/viewvc/TkrRecon/ChangeLog?view=graphimg'
cannot be displayed, because it contains errors." 

Perhaps it is relevant that this file has a lot of revisions.  Has some limit
been exceeded?

The problem was first noted with a viewvc snapshot from March 7 with cvsgraph
1.5.1.  I installed viewvc 1.0.0 and upgraded cvsgraph to 1.6.0.  That didn't
help.  We also have viewcvs 0.9.2, and it works properly.  See
http://glast.stanford.edu/cgi-bin/viewcvs.old/TkrRecon/ChangeLog?graph=1.1963
(Despite what it says, it's using cvsgraph 1.6.0).

This might be related to issue #97, but I'm not sure.