Situation: IGB users can use the right-click Filter... option in IGB to filter annotations or reads in a track based on properties such as score. However, there is a bug where if the track is separated by strand and the filter is applied to one strand and then removed in the other strand, the data do not reappear.

Task: Investigate the cause of the issue. Once we have a better understanding of the code, determine if there is a relatively easy way to accomplish one of the possible solutions below.

Possible solutions:

• If a filter is applied to a strand it can only be removed from that strand.
• If a user removes the filter from either strand, the filter is removed from both strands.
• Filters are added and removed from both strands, there is no way to add a strand-specific filter.
• It would also be nice if the filter icon appeared only for the relevant strand (right now it appears for both strands even if the filter is only applied to one strand).

To reproduce the issue:

1. Start IGB
2. Select the Arabidopsis genome
3. Navigate to Chr1:8,673,056-8,677,891
4. Right-click on the Araport track and select Filter...
5. In the Filter menu, select Add
6. In the Add filter menu, select Show Only Score
7. Click OK
8. Click OK
9. The gene model in the Araport track should now be hidden
10. Right-click on the Araport track and select Filter...
11. Select the Score filter and click on the Remove button
12. Click OK
    The filter should now be removed, but the gene model in the Araport track is still missing.