[igraph] will igraph re-number vertices?

[Matt Bonner]

Heya,

Will igraph ever silently renumber vertices/change their vertex ID's  
as a result of another operation?

For example, suppose I use decompose to eventually pull out the the  
largest component. Presuming the largest component and the full graph  
each have a vertex with ID 6, does vertex 6 in the component refer to  
the same vertex in the full graph? Is the behavior the same for the R  
functions and the C functions?

In simple tests with things like centrality measures, it seems like  
igraph doesn't ever renumber vertices in this way. However, it would  
be nice to KNOW that igraph isn't doing this for a given function, or  
for any function.

Thanks,

--Matt