Missing grid lines

We've had an ongoing issue with missing vertical grid lines in our tree 
stores.  Finally was able to find time to isolate the issue.

If you use set_visible on various tree view columns, to hide certains 
parts of the data, and then set grid lines for both or vertical on that 
view, gtk will drop off a corresponding grid line for every previous 
column that is hidden.  We have a lot of hidden columns, for various 
reasons, so we end up with only a few columns on the left having grids 
and all the rest missing. 

Haven't see any issue with the horizontal grids, probably because we 
don't attempt to hide any rows, just columns.

Has anybody seen this?  Any possible solutions, other than having to 
rework thousands of lines of code to switch all the hidden columns to 
the end of the array?  (The latter is not an option at the moment).


thanks,
Madeleine D.