Please describe the problem:
A sheet with graphs is duplicated to yield a second sheet(2) with copies of the graphs of sheet(1). The graphs on sheet(2) then still point to the original data of sheet(1). This is confusing because updating sheet(2) has no effect on the graphs shown on that sheet. It can be changed by updating the links via the properties menu. 

Steps to reproduce:
1. create sheet with data and a graph. 
2. right click sheet tab on the bottom of page to duplicate sheet
3. updating data on the new sheet does not alter the graph on the same page


Actual results:


Expected results:
I expect the graph on the duplicate sheet to use the data on the same sheet. 

Does this happen every time?
yes

Other information:
Debian 4.0 with gnumeric 1.63 from debian repository.