Visual indication of relationship with associated sequence to distinguish different sequence associated annotation rows

Structure data produce several sequence associated annotation rows. In 2.11.2, one has to mouse over a row to identify the structure and chain that the annotation row was generated from.

Ideally the label should show:
- sequence associated with the row
- the nature of the relationship (ie for a structure: '1xyz:B')

The labels could be rendered in a compact way, ie using lines to indicate common reference sequences for vertically adjacent annotation rows.