Histogram view for experiments with 2 traces with same name and different directory not working well

[bhufmann]

In histogram (e.g. in Overview view or dedicated Histogram) for experiments with 2 traces with same name and different directory not working well. For example consider the following experiment:

• exp
  • dir1
    • kernel
  • dir2
    • kernel

The histogram is not populated correct. Deselecting the second kernel trace in the tree, will make the xy graph appear (I think the xy chart of the first kernel trace - tdb).

Also, it's not possible to distinguish the 2 kernel traces in the tree on the left side.