#4 Wrong snapshots after merging segments

[George Valkanas]

Once the user has merged segments, when they request to capture snapshots, those snapshots are captured according to the initial MPEG-7 segments.

Steps to reproduce:
1) Load an MPEG-7 document
2) Load a video file
3) Use the "take snapshots" command
4) Merge any segments you like
5) Use the "take snapshots" command again..

The snapshots of the 2nd "take snapshots" execution are the same with the ones from the 1st execuion..